So I have an intex 16x48 ultra frame that is a year old now. I fought so much last season with thst crappy cartridge filter and pump, that I'm taking the plunge and getting the sand filter now. Which size do I need to get? The wife and I are in a debste bc I want the 2650gph abd she says save the money and get the 1600gph. Also,should I get the SWG or not? I just dont want to struggle with it like last year. Thanks!