I hope there's a chemist out there that can answer this question.
In preparation recently for a 'certain medical
procedure' (I'll not-so-delicately decline to say which one), I was required to drink a large quantity of Miralax, which I discovered is Polyethylene Glycol. Remembering instructions for winterizing my watermaker
, I initially thought this was the same chemical Spectra recommends - many cruisers also recommend winterizing a watermaker
instead of pickling it. Upon a closer look, Spectra recommends Propylene Glycol. After a little bit of research
, I find that Propylene Glycol is not a biocide of any sort but does have a very low freezing point. Polyethylene Glycol has a higher freezing point but, other than that, seems to have many of the same applications as propylene glycol. Since I'm in the tropics and have little concern about protecting my watermaker from freezing, is there a reason why I couldn't use polyethylene glycol as a pickling agent? One of the aspects that I like about polyethylene glycol is that it's available in a relatively low-cost powder whereas the propylene glycol I can only find in a liquid form.
I think it's clear that Spectra's instructions for winterizing with propylene glycol is merely an effort to displace the sea water
that's in the membranes and Clark pump. Does anyone have any thoughts on the matter?
Fair winds and calm seas.