In preperation for a medical
procedure (the embarrassing one), I was given a prescription for a large quantity of polyethylene glycol, which I was supposed to drink (all of it) the night before. At first, I got confused and thought I was going to be drinking my watermaker
pickling compound but a quick check on the Internet
and I discovered my error. Nonetheless, it got me to thinking about whether polyethylene glycol could be used in place of propylene glycol as a watermaker pickling method and my research
showed that the two compounds are nearly identical with the exception that polyethylene glycol has a much higher freezing point. I checked with a good friend of mine who has a PhD in chemistry and he said it would work. When I ran the idea by the people at the Spectra factory, their only concern was if it would harm the plastic parts
in the watermaker but I can't imagine it would. It's easy to find in any pharmacy and its relatively inexpensive. Could be a good alternative if you plan to pickle your watermaker in an area that doesn't have freezing temperatures.
Fair winds and calm seas.