Feser aqua:
"We have done it again with an even purer type of coolant, Feser Aqua which is a Bi-Distilled water (2 times distilled) and specially designed for todays PC watercooling market.
If your seeking a pure non conductive coolant with no dye pigments to corrupt the solution then this is 100% what you have been looking for"
TFC - The Feser Company
Yes, i would rather not use any coloring substance.
So is Feser one better than Feser Aqua?
According to
this Feser One is better.
Does the Tygon Silver Antimicrobial value its money? I would want Tygon R-3400 19/13(1/2") but Aquatuning.de does not have it, just the 5/8"(15,9/9,5mm) version.