We just bought an intex ultra frame 15x48 pool and it came with a crappy Krystal clear cartridge pump. I want to change it and get the intex 2100gph sand filter pump. I'm a little confused on how this transition will work. Currently there are 3 hoses connected to the pool. 2 suction valves and 1 valve that pushes water out. It appears the sand filter only uses 2 hoses. Do I cap off one of the inlet openings or get another hose and put a y adapter on? I already know I need hose adapters because it currently uses 1 1/4 in hose and the new pump uses 1 1/2 in hose. Please help!!