CPVC versus PVC

[eljefe281]

I am seeking feedback on the use of CPVC rather than PVC for underground piping (not aboveground piping!) in water service in a pool/spa with a salt water chlorine generator.

I believe CPVC exhibits better chemical resistance to acids and salts than does PVC.

Your opinions are very much appreciated.

[cleancloths]

Very true, but probably overkill for swimming pool water. When I was in the chemical industry we used cpvc exclusively for everything it could handle except plain water. You can use it for the pool, but it will cost more.

[Poolsean]

Agreed, it's not worth the xtra cost. CPVC is also more heat resistant and use to be used for gas heater stubouts.

[Poconos]

CPVC needs to be used for hot water piping. PVC starts getting soft well below the boiling point of water. Not sure at what temp. I read on this forum somewhere a long ago that some people use it for a couple feet close to a pool heater interface so there is a reduced chance of softening if the flow is stopped while the heater is on and before the interlocks kick it off. An unnecessary overkill for your application.
Al