I am stilll in the early stage of learning how my equipment operates, so please bear with me. When I run my pool filter, water flows from my three descents into the pool, two via the spillover spa and one from the raised bond beam. Water also flows out tof the "pool returns." While heating the pool, this is the configuration I use. When I manually engage the valve marked spa return while in filter mode, the descent from the raised bond beam stops flowing and the "pool returns" reverse flow. I hope this is normal. My question is, under which configuration should I be operating to appropriately filter my pool? Are both appropriate?