My suction side vacuum just died so I'm upgrading to a robot. However, my plumbing only has a two way valve, suction side port for vacuum or skimmer, if i switch to skimmer only the pump starts to pull in air bubbles. I see a vortex in the skimmer when i do this and the water level is fine. I did have a clog in my suction side line last week (probably what killed my vacuum) but i got that cleared. There could in theory be some sticks stuck in the skimmer line but i always keep the basket in there. If there's an underground leak I'm not going to do anything about that right now. Can i just leave it at 50/50 and leave the suction side hole open? Or is there some kind of mesh cap I can put on it so it doesn't suck up leaves and debris into the pump?