Re: Excessive usage of water maker membranes

Mark Erdos

Thanks Danny,


When flushing. I have not opened the pressure valve. Perhaps this is the issue. The user manual on this for the D60 is very vague.



With best regards,





Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia


From: [] On Behalf Of Danny and Yvonne SIMMS
Sent: Sunday, April 19, 2020 3:13 AM
Subject: Re: [AmelYachtOwners] Excessive usage of water maker membranes


We make water while motor sailing. No problems and we have the Amel single through hull for salt water intake. We never use chemicals for sterilising or pickling. Just back flush with NON chorinated water from the tank with the pressure valve totally released after each use.

Kind Regards


SM 299

Ocean Pearl

Kind Regards


SM 299


On 19 April 2020 at 18:38 Ken Powers SV Aquarius <ken@...> wrote:

Hello Mark,

On Aquarius, we also have this problem with our 24V D60.  We continually see an increase in the ppm each year.  I have a few questions so we might flush this out...

1) Do you have a pre-pump that feeds your high pressure pump?
2) For those that have a pre-pump, do you see this problem?

I am starting to get the feeling that cavitation do to air in the system is causing the problem on Aquarius.  We only have a single sea water intake, stock Amel, and we do make water while motor sailing, and this could cause air to get into the water-maker system.  With the air in the system I am led to believe this is like a jack hammer on the membranes causing micro tears to form.  Overtime, the holes get bigger, and whaalaa 1000 ppm.

I don't have the pre-pump on Aquarius, but I am planing to add the pump when I install new membranes in about 6 months. 

Does anyone have any thoughts about this?

Aboard Aquarius Locked Down in Phuket

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