The anti-corrosion properties of Red Line Water-Wetter is very important in WC systems that have more than one type of metal in contact with the water. And unlike anti-freeze, it will not lower the cooling ability of the water. As far as I know, it has very little, if any anti-bacterial or fungicidal properties.
In my original WC system (that ran for about a year and a half) I had no problems with "slime" using water-wetter. When that system died (!POP! goes the bad caps), I changed out all the vinyl tubing and the tubing almost immediately turned a weird "bubbley brown" color. I changed tubing again about 3 months ago to clearflex and have not had any problems with it. I have read about problems using Red Line Water-Wetter with acrylic resevoirs. The problems mentioned were cracking around joints and connections.
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