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

Craig Briggs


You should be able to find CruiseRO Water and Power on the internet.  Try this link.
He very effectively clears up the no-fresh-water myth and also gives the technical explanation of how fresh water at high pressure will destroy a membrane.

The Filmtec notes you quote are pretty clear that fresh (or brackish) water is no problem.

The Dessalator warning is clearly one of those cover-your-ass disclaimers to prevent customer complaints and claims like the one discussed here recently from Alden Barbour warning against using tank water to cool the refrigerant. That was because of the remote possibility the line might rupture in the tank and contaminate the drinking water and kill you when you drink it, or the user might let the tank water run low and have inadequate cooling and complain on some cruisers' forum and give Alden Barbour a bad name.

Sure, you can, indeed, blow out your RO membrane if you run it with fresh feed water at high pressure. 
Uh, don't do that.

Craig SN68

---In amelyachtowners@..., <divanz620@...> wrote :

I'm now not so sure about this fresh water business.

In the Dessalator Duo 60 manual  it says:

Remember: The biggest enemy of the membranes is fresh water.

Fresh water should be always used with no pressure when going through the system
(pressure dial turned all the way anti clockwise) and the system should always run with no
pressure after a fresh water flush to dump all the fresh water that are in it, before making
freshwater from sea water (also with the pressure dial all the way anti clockwise).
When running the watermaker with the dial all the way anti clockwise, it will shut it self
down automatically after 1 minute. Only then, the watermaker is ready for use.

I have the Filmtec Membrane Technical Manual and I can find no discussion of this at all anywhere.

In fact a number of systems are illustrated that
1. Treat Brackish water
2. RO the RO water (double RO) to make ultrapure water.

So I don;t know where this freshwater enemy story comes from......nothing on a Google search.

If it really was a problem I would think Filmtec would warn about it.

Elyse SM437

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