I'm thinking my pool is plumbed wrong, above ground with a center drain. The center drain is plumbed directly to the waste port on the filter. There is a plug which I can remove to actually use the waste line as an actual waste line, but the line continues underground and back to the center drain. If I'm correct, shouldn't it be plumbed to the intake line, along with the skimmer, with a valves on both lines so I can choose which side I'm using(or both)? Pool came with the house. This came up because of the spring clean out(Nasty storm before I was able to cover it, resulting in a ton of debris in the pool, finally it's clear, now working on getting the levels correct.) A diagram would be useful, but something just seems off with the way things are done. I'll try to grab a couple of pics of the system later. As it sits right now, I just vacuumn through the filter, and hook a hose to the clean water return to flush. Thanks for any help.......