Schedule 40 is what is usually used. I do believe 1.5" on a 2hp pump is a little on the small side and would have gone with 2". Is the pump inlet and outlet sized for 2". When you said it did not hold was your PVC cleaner and joint cement relatively new? I have had failures using old PVC cement in the past. I would let it sit pressure free overnight just to be on the safe side.
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