rebuilding my pool and ... was reading before that all pvc pipes should be connected by longer couplers and 90deg, 45 deg elbows. where can i get them ... home depot seems only has drain/waste pipes stuff not for pools ..
Typical pipe sizes are 1.5 to 2, maybe 3 inches. Older pools usually have 1.5 inch, newer one seem to be built with 2 inch or larger. Just get the same size fittings for the pipes you have. Yes Schedule 40 (maybe schedule 80 going in / out of a heater). I like using the purple primer myself - easy to tell where it has been applied - and I use almost any kind of approved PVC solvent. Do give it time to set (30 minutes or so) before pumping water through it if you can.