Re: Excessive usage of water maker membranes


Yes. I did not state in my previous post that I double filter 5 micron into the tank. I try and take all precautions but I too have high ppm after one year of new membranes. Faulty membranes maybe? A desalator dealer in Le Marin just said 500 ppm was fine and not to worry til I got to 1000! Goodness. I put dock water in today and it measures 150 ppm through the filters. Tasty. But I know that's not chlorine. Anyway probably new membranes in November and I'll cross my fingers. Good discussion. 

Joy 388

On Sun, Apr 19, 2020 at 5:12 PM Courtney Gorman via <> wrote:
When you Do you have to take marina water make sure that you fill trip with the carbon filter to remove all the coring then it will not adversely affect your membranes

sv Trippin 

On Apr 19, 2020, at 5:06 PM, Chuck_Kim_Joy <clacey9@...> wrote:

There are times when you must take marina water and thus can only flush with marina water. I find it hard to believe that the makers of the membranes would not have considered this possibility in the boating world. Then again it might be pure science and I must make water in dirty marinas and harbors come what may. I have a good supply of pre filters. 

Joy 388
Le Marin, Martinique 

On Sun, Apr 19, 2020 at 4:50 PM Hans-Joerg Wildhagen <carpediemsail@...> wrote:
Hi Mark
Never rinse the membranes with water from the Marina.
Rinse only with your own water which you have produced yourself.
Fresh water kills the membranes

Cheers Hans
SY Wasabi

Mark Erdos <mcerdos@...> schrieb am Sa., 18. Apr. 2020, 20:18:

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,





Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia


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