Re: How about pure distilled for a copper only rig?
My experiences so far in a 100% copper loop, with some brass for barbs and heatercore:
Distilled water alone = white deposit in just a few months (i'd say less than 3 months).
Distilled water + antifreeze = white deposit (whatever it is) starting after about 1 year.
Distilled water + redline WW = oily pinkish / white deposit after less than 6 months. Clearly the WW breaks down (plus the foul smell goes through the tubing).
Distilled water + various mixes of anti corrosion and tensio active fluids = immediate failures (usually due to huge foam production)
I've yet to experiment:
* vodka
* commercial anti-algae...thing.. from a german supplier
If vodka really works, considering its price relative to commercial biocides, my choice will be easy...
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