PLUMBING: Pool Return Valve
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A 180 degree turn would be to sharp of a turn which may cause back pressure or cavitating. You can use pieces of pvc pipe and 90 degree elbows to make a wider 180 degree turn. I would say 12" pieces of pipe would be sufficient.
PVC glue will be strong enough under pressure. Just make sure you use a PVC cleaner (which is purple) then use the PVC glue.
I would use two 45 degree elbows instead of one 90 degree elbow for each turn. this will remove some of the harshness of the turn and reduce the amount of back-pressure when you are flushing.
Doesn't matter if you use 1 180-degree or 2 90-degree or 4 45-degree elbows. The cumulative effect will be the same. A wider diameter elbow can reduce the PSI in the turn. A better solution might be to disassemble at the pump and rotate the discharge to begin with.
Have you tried using a back wash hose?
You could try flexible pipe used in hot tub applications. You could possibly use a stainless band-clamp with the flex as well. My backwash has a 90 deg bend with a high-flow 1HP pump with no adverse effects.