I read somewhere that running windshield washer fluid in it can keep it clean, and is affordable.
I also read that just using pure distilled water stays clean for a long time.
May need to read up on it some more.
My basement is climate controlled so I don’t need to worry about preventing freezing in the lines.
I recently posted that I had a CW-3000 chiller, which I had offered for sale, but that thing can be used for this too, not just laser, so I will probably hold onto it.
It’s an idea I’m pondering on!