We just had our pool remodeled. Part of the job involved updating our plumbing by the filter, pump, heater, etc. The pool and the fountain on same system. The fountain drain seemed to not be drawing in much water at all when main drain, skimmer, vacuum were shut off. I asked the contractor and he said debri might have gotten in the line and would need to be blown out. Also, the fountain drained down to pool level after pump shut off. He said that was probably bad check valve. Anyhow, he came out today and removed the old check valve and put straight piece of pvc in its place. He adjusted the fountain Jandy valve so it either shuts off all suction from fountain or only allows a quarter of a turn open on either side. Do I need the check valve in the line or is he just taking a short cut by making it so that the Jandy valve should always be in off which I’m guessing would stop the fountain from draining back into the pool. And also, by eliminating the possibility to open fountain full suction, you really can’t tell if there was any blockage or not. Pictures below...vertical pipe to the right is fountain suction where he removed the old valve. The fountain bypass allows pool water to flow out of fountain returns.