Date   
Re: Excessive usage of water maker membranes

Mark & Debbie Mueller
 

As it has been said earlier in this post hydrocarbons (oil, fuel, etc.), chlorine, and over pressure are by far the biggest killers of RO membranes.  Operationally, never exceeding the rated capacity of the water maker based on the flowmeter and never exceeding the maximum pressure as shown on the gauge is the rule.  If in a brackish water situation maximum flow will be achieved at far lower pressures than what would normally be seen in the “green” pressure zone i.e. it takes less pressure to make RO water when there is less salt in the feed water.

 

The way you described the operation of your water maker seems to meet all the manufacturer’s recommendations; you might look to an over pressure condition.  According to Dow a major manufacturer of the membranes the nominal operating pressure is 800 psig (55 bar).  If you could get a pressure gauge that shows actual pressure & connect it to your system you could verify that your Dessalator gauge is reading accurately and not showing a lower than normal pressure reading causing you to apply a higher than recommended pressure causing damage to the membranes.
--
Mark Mueller
Brass Ring  A54

Re: Excessive usage of water maker membranes

Mohammad Shirloo
 

Hi Paul;

 

Was there a specific issue that you were dealing with that led Martin to give you that advice?

 

Happy Sailing;

 

 

Mohammad and Aty

B&B Kokomo

AMEL 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Paul Dowd and Sharon Brown via groups.io
Sent: Sunday, April 19, 2020 2:44 AM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Mohammad,

 

I was told by Martin to run the water maker with the pressure at the beginning of the green zone. It also says this in the manual.

 

Cheers,

Paul

S/Y Ya Fohi - Amel 54 #98 - Grenada

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mohammad Shirloo
Sent: 19 April 2020 08:32
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi;

 

When we first purchased Kokomo, I had detailed discussions with Martin, the head tech at Dessalator, about the environments that the water maker could be used and best practices. The following was my takeaway:

 

  1. The water maker can be run safely in most waters. This includes harbors, marinas and even water that is not clear. I was told that the main detriment would be more frequent changes to the pre-filters.
  2. The water maker can be, and should be, run in the high end of the green zone. This will lead to more water production, without any downsides.
  3. Performing an auto fresh water flush after every usage is unnecessary and wastes about 20 liters of fresh water. As long as the water maker in run at least every week, a fresh water flush is unnecessary. We simply stop making water by shutting down the switch and then backing out the pressure valve.
  4. Utilize the powder provided by Dessalator to prep the membranes for the winter season.

 

We have done the above for 5 seasons of about 5 months each. The pre-filters typically last a whole season. We never put any water in the tank other than from the water maker. The water quality is always below 250 PPM. When we purchased Kokomo, the water maker had only 60 hours on it. So, I’m fairly sure that our membranes are original from 2008 and therefore 12 years old. The water maker now has around 550 hours. I was told that after 500 hours, the quality will probably start to drop. Our usage has solely been in the Med.

 

Happy Sailing;

 

 

Mohammad and Aty

B&B Kokomo

AMEL 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mark Erdos via groups.io
Sent: Saturday, April 18, 2020 9:35 PM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Colin,

 

Yes, I re-read that part and it is a little confusing how I wrote it. In marina, we do a fresh water flush aobut once a week. We do not run the water maker in that environment.

 

Thanks for the insight, I guess I need to be more fussy about where we run it. I thought the pre-filter would help a lot. I guess not.

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of islandpearl2_sm2k332
Sent: Saturday, April 18, 2020 10:47 PM
To: main@amelyachtowners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Mark

 

We had the 100L/Hr Duo on Island Pearl II and went around the work in three years with a new 2016 set of membranes. Those membranes were still perfect at the end of our trip doing a full 100L/Hr easily on the a/c current but slightly down to 75L/hr on the DC current motor. 

 

We were absolutely fussy about the cleanliness of ocean water before running it and were sometimes scoffed at by others eg in Rodrigues (Indian Ocean) for lifting anchor, risking losing our good spot to go out to sea every four-five days to make water whilst other cruiser friends simply made water inside the large seawater harbour where we felt the water was not up to scratch. Also, we never took the boat out onto the hard for a season, even though we had planned to do this in the Caribbean in 2019.

 

If you are careful like this, which I suspect you are, then there must be something else at play with your system and I look forward to hearing about that from other more experienced cruisers here.

 

Also, since we have communicated often and I admire your equally careful approach to looking after Creampuff, I highly suspect that when you refer to "running your watermaker at least once per week in marina's", that you actually meant "doing a freshwater flush cycle" in the marina from your tank as per the manual requirements.... rather than actually making water from the extremely dirty marina seawater which would totally explain everything about your problems, but which I am equally sure you would never have done. 

 

Colin Streeter

Brisbane ex Island Pearl II

 

On Sun, Apr 19, 2020 at 12:10 PM Danny and Yvonne SIMMS <simms@...> wrote:

Hi Mark.

I am very careful about where i run my watermaker. Never in a marina and it has to be an exeptionaly clean harbour before I will run it there. Also I am paranoid about even traces of chlorine. It is many years since I allowed any chlorinated water into my tank. However you living full time aboard would suggest a lot of use. Like a car,  its not the time that wears them out but the milage. 

Regards

Danny

SM 299

Ocean Pearl

On 19 April 2020 at 12:21 Mark Erdos <mcerdos@...> wrote:

I need a little help with water maker usage and maintenance, please.

 

Cream Puff has a 24v D60 water-maker. My problem is we seem to be going through membranes at the rate of a pair a year. I have read where others have used the same set of membranes for years and still get drinkable water. This is not the case with us. We are in our 5th year of full time cruising and are now on our 6th set of membranes.

 

When I last change membranes in Colombia, this was about March 2019. Our current membranes are just over a year old. The PPMs are starting to creep up a bit now and we have gone from the 300 range to the 500 range. We notice a change in drinking quality over 600 PPMs. This is when we usually change the membranes.

 

We run the water-maker at least once a week when in a marina, flush it with the fresh water rinse. I have a double charcoal filter set up for the tank rinse. When on anchor it is run just about every day. I am careful to watch the pressure and water making float gauge. I normally set it at 55 liters per hour and this put the pressure in lower side of the green range.

 

Any ideas why our membranes are not lasting or why our PPMs creep up?

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 


 


 


 

--

Colin Streeter

0411 016 445


--
Cheers
Paul
Ya Fohi - Amel 54 #98

Cleaning the prop

Alexander Schenk
 

Covid- project - getting replacement prop to shine again...

Using grandmothers old recipe (toothpaste) and it takes its time... any better ideas around?

Best
Alexander

SY Antinea
SM #231

locked Re: Off Topic, but vital info

 

The original posting has nothing to do with Amel Yachts. I am locking this message topic.

As a reminder:
We encourage postings which will genuinely help Amel owners source needed parts and services. We encourage you to support the Amel brand and be respectful to the brand in your postings. Care should be taken to not post anything that could be considered offensive or derogatory regarding Amel, any Member, or Sponsor. Please refrain from political issues, rude, or inappropriate language. Please refrain from criticism of persons or businesses in which you may have experienced unsatisfactory results, because it would be one-sided, without the ability of the other side to respond. Members will register with their given names rather than aliases. Members who currently own an Amel should always sign postings with their given name, boat name, Amel model, and hull number.    
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Sun, Apr 19, 2020 at 10:14 AM martin haméline <marafiki37@...> wrote:
Sounds like a Political conspiracy 
Is this the purpose of Amel Owners forum?


On Apr 19, 2020, at 11:01 AM, arthur saftlas <art@...> wrote:

This video interview answers the question, What in this world is really going on?
A famous doctor answers this on a little known channel, because it is against the mainstream.
Please watch and share once you realize this is vital information.

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

Rink De Haan
 

Hi Bill
I am also interested.
Topic for me could be: changing the old B&G network to NME2000 and current systems.

Best regards
Rink
Amel SM2k #330 Razors Edge


Van: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> namens CW Bill Rouse <brouse@...>
Verzonden: Saturday, April 18, 2020 4:13:41 PM
Aan: main@AmelYachtOwners.groups.io Notification <main@amelyachtowners.groups.io>
Onderwerp: Re: [AmelYachtOwners] 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿
 
All,

I am going to wait a few more days to be able to get some more comments. I have been contacted by one group member who is an experienced ZOOM administrator and has a commercial account with ZOOM. This will benefit all of us.

Those interested please reply to this thread with their suggested topic(s), or any other suggestions. Once I have those suggestions, I will produce a "poll" of suggested date/times and topics.

When the above is completed, I plan to turn it over to the volunteer owner/administrator.

I am looking forward to this.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Sat, Apr 18, 2020 at 8:26 AM Brian Riggs <7briggs@...> wrote:
As a future SM2k owner, I'd love to lurk as well.

Cheers!
Brian Riggs

On Sat, Apr 18, 2020, 09:20 Porter McRoberts via groups.io <portermcroberts=yahoo.com@groups.io> wrote:
Love to be a part of this. Regardless of topics.
Porter 
S/v ibis


On Apr 18, 2020, at 9:03 AM, HOFMEYR SCHOLTZ <hoffi@...> wrote:

I there,
I'm a near-future Amel owner. If you'd have me please count me in.
Hofmeyr

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

Randall
 

Very interested.
The two topics?
1- how to fix, repair or replace info for everything.
2- where to source any relevant parts.
I know were surrounded by knowledge and good people. So many have documentation on how to teach us.
Now we need a central, and user friendly info site.

Randall
A54-#56

On Sat, Apr 18, 2020 at 4:14 PM CW Bill Rouse <brouse@...> wrote:
All,

I am going to wait a few more days to be able to get some more comments. I have been contacted by one group member who is an experienced ZOOM administrator and has a commercial account with ZOOM. This will benefit all of us.

Those interested please reply to this thread with their suggested topic(s), or any other suggestions. Once I have those suggestions, I will produce a "poll" of suggested date/times and topics.

When the above is completed, I plan to turn it over to the volunteer owner/administrator.

I am looking forward to this.

Bill
CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar


On Sat, Apr 18, 2020 at 8:26 AM Brian Riggs <7briggs@...> wrote:
As a future SM2k owner, I'd love to lurk as well.

Cheers!
Brian Riggs

On Sat, Apr 18, 2020, 09:20 Porter McRoberts via groups.io <portermcroberts=yahoo.com@groups.io> wrote:
Love to be a part of this. Regardless of topics.
Porter 
S/v ibis


On Apr 18, 2020, at 9:03 AM, HOFMEYR SCHOLTZ <hoffi@...> wrote:

I there,
I'm a near-future Amel owner. If you'd have me please count me in.
Hofmeyr

locked Re: Off Topic, but vital info

martin haméline
 

Sounds like a Political conspiracy 
Is this the purpose of Amel Owners forum?


On Apr 19, 2020, at 11:01 AM, arthur saftlas <art@...> wrote:

This video interview answers the question, What in this world is really going on?
A famous doctor answers this on a little known channel, because it is against the mainstream.
Please watch and share once you realize this is vital information.

locked Off Topic, but vital info

arthur saftlas
 

This video interview answers the question, What in this world is really going on?
A famous doctor answers this on a little known channel, because it is against the mainstream.
Please watch and share once you realize this is vital information.

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

martin haméline
 

Thanks Bill

Agree and interested 

Martin Hameline 
VoileOVent 
Maramu 


On Apr 19, 2020, at 10:40 AM, Marco Mancini <marcomancini61@...> wrote:

Thanks Bill will be of course a nice initiative to meet the Amel community. 
cheers 
Marco Mancini 
SM Desiree 304 

Il giorno 19 apr 2020, alle ore 16:15, Anthony Wetmore <Shogunpug@...> ha scritto:

We would definitely be interested in this as new Santorin owners since December.  We have much to learn.

Tony Wetmore
Notorious

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

Marco Mancini
 

Thanks Bill will be of course a nice initiative to meet the Amel community. 
cheers 
Marco Mancini 
SM Desiree 304 

Il giorno 19 apr 2020, alle ore 16:15, Anthony Wetmore <Shogunpug@...> ha scritto:

We would definitely be interested in this as new Santorin owners since December.  We have much to learn.

Tony Wetmore
Notorious

Re: Excessive usage of water maker membranes

Miles
 

Hi Mark,

I once ruined a set of membranes by putting chlorinated dock water in the boat and then back flushing.  Since then any shore water that goes into the boat first goes through a “whole house” filter that removes chlorine.  To check this, I have test stripes that measure the amount of chlorine in water.  The test kit is sold in tropical fish stores.  My filters are over 10 years old.  I have been told that the more the filters are used, the longer they will last. When I don’t use the water maker much, the TDS goes up toward 300.  When I use the water maker for my total supply off-shore or in a very clean harbor, the TDS goes back down toward 200. 

I agree with the comments.   I also run the water without pressure for several minutes when I turn it on to get all the fresh water from the back flushing out. I agree with Alan that the pressure with fresh water could be damaging.

Regards,

Miles  s/y Ladybug,  sm216,  locked down in Le Marin, Martinique

 

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

Anthony Wetmore
 

We would definitely be interested in this as new Santorin owners since December.  We have much to learn.

Tony Wetmore
Notorious

Re: Shaft and propeller for Sharki - R&D project.

Diego de Miguel (Sailing Living Lab) Amel Sharki
 

Merci Philippe!

Re: Shaft and propeller for Sharki - R&D project.

Diego de Miguel (Sailing Living Lab) Amel Sharki
 

Merci Dominique!

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

PAOLO CUNEO
 

Hi Bill, Hi all,
No matter the topics, it is a fantastic opportunity to get closer to our great community. I am in by all means!

Paolo Cuneo
SM 454 “ Whisper”


Inviato da iPad

Re: 𝗭𝗢𝗢𝗠 𝗴𝗲𝘁 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿

Charles Bell
 

Interested, please invite me,

Re: Excessive usage of water maker membranes

Paul Dowd and Sharon Brown
 

Mohammad,

 

I was told by Martin to run the water maker with the pressure at the beginning of the green zone. It also says this in the manual.

 

Cheers,

Paul

S/Y Ya Fohi - Amel 54 #98 - Grenada

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mohammad Shirloo
Sent: 19 April 2020 08:32
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi;

 

When we first purchased Kokomo, I had detailed discussions with Martin, the head tech at Dessalator, about the environments that the water maker could be used and best practices. The following was my takeaway:

 

  1. The water maker can be run safely in most waters. This includes harbors, marinas and even water that is not clear. I was told that the main detriment would be more frequent changes to the pre-filters.
  2. The water maker can be, and should be, run in the high end of the green zone. This will lead to more water production, without any downsides.
  3. Performing an auto fresh water flush after every usage is unnecessary and wastes about 20 liters of fresh water. As long as the water maker in run at least every week, a fresh water flush is unnecessary. We simply stop making water by shutting down the switch and then backing out the pressure valve.
  4. Utilize the powder provided by Dessalator to prep the membranes for the winter season.

 

We have done the above for 5 seasons of about 5 months each. The pre-filters typically last a whole season. We never put any water in the tank other than from the water maker. The water quality is always below 250 PPM. When we purchased Kokomo, the water maker had only 60 hours on it. So, I’m fairly sure that our membranes are original from 2008 and therefore 12 years old. The water maker now has around 550 hours. I was told that after 500 hours, the quality will probably start to drop. Our usage has solely been in the Med.

 

Happy Sailing;

 

 

Mohammad and Aty

B&B Kokomo

AMEL 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mark Erdos via groups.io
Sent: Saturday, April 18, 2020 9:35 PM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Colin,

 

Yes, I re-read that part and it is a little confusing how I wrote it. In marina, we do a fresh water flush aobut once a week. We do not run the water maker in that environment.

 

Thanks for the insight, I guess I need to be more fussy about where we run it. I thought the pre-filter would help a lot. I guess not.

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of islandpearl2_sm2k332
Sent: Saturday, April 18, 2020 10:47 PM
To: main@amelyachtowners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Mark

 

We had the 100L/Hr Duo on Island Pearl II and went around the work in three years with a new 2016 set of membranes. Those membranes were still perfect at the end of our trip doing a full 100L/Hr easily on the a/c current but slightly down to 75L/hr on the DC current motor. 

 

We were absolutely fussy about the cleanliness of ocean water before running it and were sometimes scoffed at by others eg in Rodrigues (Indian Ocean) for lifting anchor, risking losing our good spot to go out to sea every four-five days to make water whilst other cruiser friends simply made water inside the large seawater harbour where we felt the water was not up to scratch. Also, we never took the boat out onto the hard for a season, even though we had planned to do this in the Caribbean in 2019.

 

If you are careful like this, which I suspect you are, then there must be something else at play with your system and I look forward to hearing about that from other more experienced cruisers here.

 

Also, since we have communicated often and I admire your equally careful approach to looking after Creampuff, I highly suspect that when you refer to "running your watermaker at least once per week in marina's", that you actually meant "doing a freshwater flush cycle" in the marina from your tank as per the manual requirements.... rather than actually making water from the extremely dirty marina seawater which would totally explain everything about your problems, but which I am equally sure you would never have done. 

 

Colin Streeter

Brisbane ex Island Pearl II

 

On Sun, Apr 19, 2020 at 12:10 PM Danny and Yvonne SIMMS <simms@...> wrote:

Hi Mark.

I am very careful about where i run my watermaker. Never in a marina and it has to be an exeptionaly clean harbour before I will run it there. Also I am paranoid about even traces of chlorine. It is many years since I allowed any chlorinated water into my tank. However you living full time aboard would suggest a lot of use. Like a car,  its not the time that wears them out but the milage. 

Regards

Danny

SM 299

Ocean Pearl

On 19 April 2020 at 12:21 Mark Erdos <mcerdos@...> wrote:

I need a little help with water maker usage and maintenance, please.

 

Cream Puff has a 24v D60 water-maker. My problem is we seem to be going through membranes at the rate of a pair a year. I have read where others have used the same set of membranes for years and still get drinkable water. This is not the case with us. We are in our 5th year of full time cruising and are now on our 6th set of membranes.

 

When I last change membranes in Colombia, this was about March 2019. Our current membranes are just over a year old. The PPMs are starting to creep up a bit now and we have gone from the 300 range to the 500 range. We notice a change in drinking quality over 600 PPMs. This is when we usually change the membranes.

 

We run the water-maker at least once a week when in a marina, flush it with the fresh water rinse. I have a double charcoal filter set up for the tank rinse. When on anchor it is run just about every day. I am careful to watch the pressure and water making float gauge. I normally set it at 55 liters per hour and this put the pressure in lower side of the green range.

 

Any ideas why our membranes are not lasting or why our PPMs creep up?

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 


 


 


 

--

Colin Streeter

0411 016 445


--
Cheers
Paul
Ya Fohi - Amel 54 #98

Re: Excessive usage of water maker membranes

Paul Dowd and Sharon Brown
 

Mark,

 

Mine recently went bad after just a few months use. It turns out that there was a boat upwind of us in the anchorage leaking diesel. I’m told that any kind of fuel leak is very bad for membranes and can destroy them quickly. If you are using your water maker in a marina on a regular basis then I would think there is a possibility that it may be a  small quantity of hydrocarbons in the water on a regular basis getting into your membranes.

 

Cheers,

Paul

S/Y Ya Fohi - Amel 54 #98 - Grenada

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mark Erdos
Sent: 19 April 2020 01:22
To: AmelYachtOwners@groups.io
Subject: [AmelYachtOwners] Excessive usage of water maker membranes

 

I need a little help with water maker usage and maintenance, please.

 

Cream Puff has a 24v D60 water-maker. My problem is we seem to be going through membranes at the rate of a pair a year. I have read where others have used the same set of membranes for years and still get drinkable water. This is not the case with us. We are in our 5th year of full time cruising and are now on our 6th set of membranes.

 

When I last change membranes in Colombia, this was about March 2019. Our current membranes are just over a year old. The PPMs are starting to creep up a bit now and we have gone from the 300 range to the 500 range. We notice a change in drinking quality over 600 PPMs. This is when we usually change the membranes.

 

We run the water-maker at least once a week when in a marina, flush it with the fresh water rinse. I have a double charcoal filter set up for the tank rinse. When on anchor it is run just about every day. I am careful to watch the pressure and water making float gauge. I normally set it at 55 liters per hour and this put the pressure in lower side of the green range.

 

Any ideas why our membranes are not lasting or why our PPMs creep up?

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 


--
Cheers
Paul
Ya Fohi - Amel 54 #98

Re: Excessive usage of water maker membranes

Alan Leslie
 

Regarding the air...motor sailing...
We too have been doing this for years without problems. If we know we'll have the main engine on for a while, the watermaker is always on, same when running the generator when sailing on passage...or at anchor.
Our membranes are now 7 years old.
Cheers
Alan
Elyse SM437 ... hiding out in Opua 

Re: Excessive usage of water maker membranes

Mohammad Shirloo
 

Hi;

 

When we first purchased Kokomo, I had detailed discussions with Martin, the head tech at Dessalator, about the environments that the water maker could be used and best practices. The following was my takeaway:

 

  1. The water maker can be run safely in most waters. This includes harbors, marinas and even water that is not clear. I was told that the main detriment would be more frequent changes to the pre-filters.
  2. The water maker can be, and should be, run in the high end of the green zone. This will lead to more water production, without any downsides.
  3. Performing an auto fresh water flush after every usage is unnecessary and wastes about 20 liters of fresh water. As long as the water maker in run at least every week, a fresh water flush is unnecessary. We simply stop making water by shutting down the switch and then backing out the pressure valve.
  4. Utilize the powder provided by Dessalator to prep the membranes for the winter season.

 

We have done the above for 5 seasons of about 5 months each. The pre-filters typically last a whole season. We never put any water in the tank other than from the water maker. The water quality is always below 250 PPM. When we purchased Kokomo, the water maker had only 60 hours on it. So, I’m fairly sure that our membranes are original from 2008 and therefore 12 years old. The water maker now has around 550 hours. I was told that after 500 hours, the quality will probably start to drop. Our usage has solely been in the Med.

 

Happy Sailing;

 

 

Mohammad and Aty

B&B Kokomo

AMEL 54 #099

 

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Mark Erdos via groups.io
Sent: Saturday, April 18, 2020 9:35 PM
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Colin,

 

Yes, I re-read that part and it is a little confusing how I wrote it. In marina, we do a fresh water flush aobut once a week. We do not run the water maker in that environment.

 

Thanks for the insight, I guess I need to be more fussy about where we run it. I thought the pre-filter would help a lot. I guess not.

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of islandpearl2_sm2k332
Sent: Saturday, April 18, 2020 10:47 PM
To: main@amelyachtowners.groups.io
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes

 

Hi Mark

 

We had the 100L/Hr Duo on Island Pearl II and went around the work in three years with a new 2016 set of membranes. Those membranes were still perfect at the end of our trip doing a full 100L/Hr easily on the a/c current but slightly down to 75L/hr on the DC current motor. 

 

We were absolutely fussy about the cleanliness of ocean water before running it and were sometimes scoffed at by others eg in Rodrigues (Indian Ocean) for lifting anchor, risking losing our good spot to go out to sea every four-five days to make water whilst other cruiser friends simply made water inside the large seawater harbour where we felt the water was not up to scratch. Also, we never took the boat out onto the hard for a season, even though we had planned to do this in the Caribbean in 2019.

 

If you are careful like this, which I suspect you are, then there must be something else at play with your system and I look forward to hearing about that from other more experienced cruisers here.

 

Also, since we have communicated often and I admire your equally careful approach to looking after Creampuff, I highly suspect that when you refer to "running your watermaker at least once per week in marina's", that you actually meant "doing a freshwater flush cycle" in the marina from your tank as per the manual requirements.... rather than actually making water from the extremely dirty marina seawater which would totally explain everything about your problems, but which I am equally sure you would never have done. 

 

Colin Streeter

Brisbane ex Island Pearl II

 

On Sun, Apr 19, 2020 at 12:10 PM Danny and Yvonne SIMMS <simms@...> wrote:

Hi Mark.

I am very careful about where i run my watermaker. Never in a marina and it has to be an exeptionaly clean harbour before I will run it there. Also I am paranoid about even traces of chlorine. It is many years since I allowed any chlorinated water into my tank. However you living full time aboard would suggest a lot of use. Like a car,  its not the time that wears them out but the milage. 

Regards

Danny

SM 299

Ocean Pearl

On 19 April 2020 at 12:21 Mark Erdos <mcerdos@...> wrote:

I need a little help with water maker usage and maintenance, please.

 

Cream Puff has a 24v D60 water-maker. My problem is we seem to be going through membranes at the rate of a pair a year. I have read where others have used the same set of membranes for years and still get drinkable water. This is not the case with us. We are in our 5th year of full time cruising and are now on our 6th set of membranes.

 

When I last change membranes in Colombia, this was about March 2019. Our current membranes are just over a year old. The PPMs are starting to creep up a bit now and we have gone from the 300 range to the 500 range. We notice a change in drinking quality over 600 PPMs. This is when we usually change the membranes.

 

We run the water-maker at least once a week when in a marina, flush it with the fresh water rinse. I have a double charcoal filter set up for the tank rinse. When on anchor it is run just about every day. I am careful to watch the pressure and water making float gauge. I normally set it at 55 liters per hour and this put the pressure in lower side of the green range.

 

Any ideas why our membranes are not lasting or why our PPMs creep up?

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia

www.creampuff.us

 


 


 


 

--

Colin Streeter

0411 016 445