I have a 20' x 50' rectangular pool. It has an old Hayward Bump filter that is way oversized. My plumbing is only 1 1/2". I have a Hayward 1.5HP pump. Pool has two pipes for suction two for return. Been researching pluses and minus on filters and leaning towards Pentair Quad DE 100. This will give me a large filter that will use a combo of cartridge and DE. Just want to make sure that my pump can handle this and that i'm making the right choice.