i was told by the tech that replaced the pump and filter to my pool that i possibly have a suction side leak causing a no flow situation after the filter. i by passed the suction side plumbling with 2inch pvc directly from the pump to the pool and i am getting the same results. ok suction starts out strong and the flow through the filter to the return is strong initially but dwindles down to nothing after about 15 minutes. i have a haward pump and de filter and a larger approximately 30 by 20 pool. any suggestions as to how to diagnose this problem