Hello, I am a new pool owner of 2 months and now feel good about chemicals and am now trying to fully understand the pumping system. I have recently noticed my skimmer not being as effective, which after some research here I think may be caused by needing to backwash my DE filter (did it one month ago, pressure now up from 27 to 31), or that I've been filling my pool too full.
I want to experiment with the flow to the skimmer vs the main drain, and I'm not sure where those valves are. I have attached a photo. If my assumption is correct, "In 1" is from the MD and is totally shut off, and "In 2 is from the skimmer and wide open. So I really can't get any more skimmer action. Those both tie in together and go to the inlet to the pump on the far left. The return is shown coming from our solar system, which is bypassed right now as I thought the flow was pretty low. I can't prove it, just the noise of water coming back down seemed more like trickling than gushing.
Any advice on those two inlets and how best to diagnose my perceived lower "flow" are appreciated. Thanks.