I had a friend give me a Hayward C550 filter w/1hp pump today. Problem I am having is it can't get enough water through the skimmer intake and return jet of my Intex 18ft AGP, and the Strainer basket is sucked dry. When I run the filter with both supply and return hoses over the side in the pool, the flow is great. What should I do to increase flow through the ports. This filter is a beast compared to the dinky thing that came with the pool.