After returning from the Bahamas last April, I "pickled" my water maker, with the assumption that I would not use the water maker here but would use it again next fall. With COVID-19, we decided to skip the Bahamas this year, so I needed to winterize the water maker. Turns out that propylene glycol is a better long term preservative anyway and can last up to 2 years.
Before switching to PG, I wanted to purge all of the other pickling agent from the system, so I did a fresh water flush and we took the boat out into the bay and made water. The CruiseROWaterMaker still worked like a charm, although the bay water certainly gummed up my prefilters. With 30 gals of RO water made, I could flush the system again with RO water, then load the system with PG. Worked great.
We spent about 4 hours out on the water motoring around and anchored in the bay for a beautiful afternoon.