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About 2 1/2 years ago my company re piped about 200 ft of heating water supply and return underground with 6'' CPVC. We have had nothing but problems out of it. We have made numerous repairs of couplings and 45's It got so bad that we replaced the whole run, again it leaked. The glue joints are breaking. Had it tested by the glue company and by the manufacturer. They both blame each other. I am beginning to believe its something in the ground reacting with the chemical and the glue. Some of the fittings have blown completely off after months of being in service. Needless to say we are at our wits end and no one has any answers. I voted that we tear it all out and go back with steel, which is what they had in the first place. Electrolysis reeked havoc on the steel before. That's why they chose CPVC. Anyone ever ran into this?