I think Poconos is right. If those 90 deg bends coming out of the pump aren't Sched 40 or better you have little chance of them standing the pressure. Those are only drain strength. EVERYTHING you use on the pool should be Sched 40.

You'll have to try working the routing to the filter differently--of course, if it's the PVC to the black fittings on the filter that's failing, you'll need some sort of PVC to ABS adaptor to make that work.