This is from a thread awhile back on piping for your aquarium.
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Originally Posted by StirCrazy
another PVC to watch out for is CPVC, I wouldent use this if you pay me.. it is chloranated to prevent "bio film" build up.. this is the major down fall with normal PVC when comparing against copper lines.. copper lines after 20 years are still clean inside... PVC after a couple months starts to develop a film, which left unchecked coule restrict flow.. the answer to this problem... CPVC.. now do you realy want something that kills bio life in your tank?
Steve
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