There is a marine
“water makers discussion group” on Facebook. It has an international membership
. Some on there work
for watermaker manufacturers. And there is helpful advice independent of brand.
I winterize with PG. but there are some oring compounds that do not tolerate it well. As in they crumble and you need to replace them.
Your manufacturer should know and be able to tell you.
But sometimes those component parts
are changed with time. Or replaced with parts
that are fine except for winterizing.
I’d ask in that group and see what you hear.