Water Wetter does cause problems with some brands of vinyl tubing and not with others, I've had it both ways. I have also heard of it causing problems with acrylic topped water blocks (cracking around metal hose barb connections. This could also be caused by the different thermal expansion coefficients of metal barbs and plastic tops). I have not had this problem. The problem with some vinyl hose is probably due to small amounts of organic solvents in Water Wetter that attack some plastics. I've had no problems with Clearflex tubing and I assume that there would be no problems with Tygon tubing either. I continue use it because it helps prevent corrosion without greatly affecting the thermal properties of water, unlike glycol based antifreeze.
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