Re: [Amel Yacht Owners] Re: Watermaker and transmission fluid

Craig Briggs

Hi Pat,

You definitely can run your watermaker in fresh water without ruining the membrane(s). The only caveat is that you must not exceed your fresh water output rating.  

Start your unit up with, as Alan says, the pressure knob fully closed (which you normally do). Then bring the pressure up slowly and monitor the fresh water output flow. In sea water, where you might need 800 psi to get your rated output (mine is 20 gph), in brackish it's maybe 400 or so and only 200ish in fresh water.

For a good video on this by Rich Boren, who owns the CruiseRO company, check out
If the link on the last line gets garbled by yahoo, it is http colon slash slash blog dot cruiserowaterandpower dot com slash can-i-run-a-marine-water-maker-in-fresh-or-brackish-water slash

I used to do this all the time on Sangaris, so I know it works.

Cheers, Craig SN68

---In amelyachtowners@..., <sailw32@...> wrote :

Alan, I am concerned about that , leaving them pickled so long and they were new four years ago. So it sounds like there is no way to fully test the system until I get to salt water. If I could find a way to make up some salt water and recirculate it ,that would work. I would like to put it through a stress test prior to heading for the Caribbean.
SM Shenanigans

-----Original Message-----
From: divanz620@... [amelyachtowners] <amelyachtowners@...>
To: amelyachtowners <amelyachtowners@...>
Sent: Wed, Aug 22, 2018 4:33 pm
Subject: [Amel Yacht Owners] Re: Watermaker and transmission fluid

Hi Pat,

ATF 90 - Automatic Transmission Fluid SAE 90

You can rinse the membranes with fresh water with the pressure knob fully anti clockwise i.e. no pressure.
If you pressurise the membranes with fresh water you will ruin them - if they are not already ruined from sitting pickled for that length of time.

Elyse SM437


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