My skimmers don't seem to create much of a suction, everything just floats on top of the water in the skimmer and not sucked down in the basket. I turned my valve today to add water into my pool and I noticed that everything in my skimmer was pushed back out into my pool. Should water be able to come up through the skimmer back into the pool? My pump was running on a low speed at the time, not sure if that matters. I just expected it to come through the return lines into the pool.