Schedule 40 PVC vs. DWV PVC
Pool PVC should be marked "Schedule 40". Schedule 40 PVC is made for water under pressure.
You will find PVC pipe and fittings marked DWV (Drain, Waste, Vent). DWV is for non-pressurized plumbing and should not be used for a pool. DWV PVC has thinner walls then Schedule 40 PVC.
Schedule 40 PVC parts have deeper hubs (ends) then DWV PVC parts. The shallower ends on DWV parts is the way to identify their incorrect use in pool plumbing.
You may also find Schedule 80 PVC. Schedule 80 PVC is designed for higher pressure applications and can be used in place of Schedule 40 PVC.
CPVC is sometimes used in pump unions. CPVC can withstand heat and can safely carry drinking water.
Cutting PVC
Gluing PVC
Painting PVC
Prolonged exposure to UV rays (the sun) can degrade PVC and make it prone to cracking. In sunny climates PVC is often painted to protect it from UV degradation.
