I read that, but I wonder if anyone has any specific instruction for the flakey algae/mildew/mold/whoknows. My bleach solution didn't seem to "dissolve" it as I had hoped.. It broke some of it up but there must be all sorts of this material just hanging out in various parts
of the system. I'll go for a long time not seeing any of the crud, then all of a sudden it will burp some more out.
It seems like my only two options are taking the whole system apart and mechanically cleaning
everything out, and probably replacing hoses, or hooking up to a hose and flushing
the system for an eternity, and even then not knowing if some little nook is about to shake loose another bunch of crud.
Also, how to avoid this when winterizing? This stuff appeared in a system that was full of pink propylene glycol - perhaps I had more water in there than I thought and so it was too dilute? Will a proper concentration of propolyene glycol prevent this stuff from forming? Should I be leaving all my hoses _dry_ instead of full of glycol? (This will require some new plumbing
strategies if so.)