I think I remember reading a comparison of addatives ( surficants, anti-corrosives, anti-foam, biocides ..) at overclockers.com that said some of the addatives in water-wetter were much more antagonistic to plastics. Seemed at the time to me a plasible explanation of why one of my (low budget) flowmeters was jamming: some water-wetter component permeating & sewelling the bearings.
Also, hoses took a color, more hairline cracks near torqued acrylics. I suspect it may have permanently softened the plastic in an eheim as well.
Stiching together pH-s "35C or so...high water temps because you're passively cooling..." and Marci's "so what? Do you sit with your nose over your pipes all day?" with a yes and a yes (~ 250 watts waste heat sustained average, 100% passively cooled, fanless, silent, sometimes 24/7 in a small room ... spill a drop filling and whiff it for a month whenever the rig hits 35...) all the fancier addatives smell more. A high mix (20-25% ?) of almost pure ethyene glycol or propylene glycol with mild anticorrosives only -- like from a solar heating or hydronics outlet, the stuff that implies "some day your child or pet will chug a load of this and it won't kill them or lobotamize them..." -- that's easier on the nose, but hard on temps.
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