Need to know what is the quietest & highest GPH return pump

[RyanJ]

Ohh no no need for new PVC just drill a 1/2 or 3/4" hole In your main supply line, tap the hole, and thread in a barb fitting.. With some PVC glue thread image PVC barb in and put yourself a valve on it and put it in your sump.. Open the valve till the pump quiets down.. It may be ghetto.. But.. It will release the back pressure..