We also only use desalinated water in the fresh water tank. We empty out completely when we leave her for the winter.
As far as concerns about pollution in the water where we are running the desalinate, I talked to Martin at Dessalator when we initially purchased our 54 to find out exactly where we could use it to have safe fresh water. Martin has been at Dessalator tech department for a long time and is extremely knowledgeable about their systems. He assured me that the unit can be used almost anywhere and that the filtration is so fine that bacteria and even viruses would not go through. He mentioned that we simply clog up the pre-filters quicker by using it in water that has contaminants.
We have used ours in harbors and marinas without any issues. We regularly check the quality of the water and we are usually in the 220 PPM range. I believe the safe water level is 500 PPM. I guess I never asked if it makes a difference what the "parts" are.
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, December 27, 2017 6:29 PM
Subject: Re: [Amel Yacht Owners] Re: Bilge maintenance
We never add anything to the fresh water tanks, except RO water. We avoid running the RO system in harbors, and any place we even suspect might be polluted. We routinely keep the tank as near to full as we can. The only exception has been when we are in a boatyard for longer than a tank of water lasts, we eventually have to break down and put tap water in.
If I was anyplace I worried about any kind of pathogen in the source water, I'd break my own "rules" and would chlorinate the tank just to be safe.
Key West, FL
---In amelyachtowners@..., wrote :
Bill, Since you don't use bleach , what if anything do you put in your water tank to reduce bacteria growth .
Pat SM #123