I have had an above ground salt water pool for 9 years now. It is 27 x 54. Never had any problems whatsoever with it. Two years ago I bought a new 1.5 hp pump. This year I bought a PRC 120 cartridge filter system. Since we have installed the new filter system we have not been able to get our pool clear!! We have done everything and spent a fortune this summer trying to get it not to be green!!! We have shocked it repeatedly, we have poured gallons of Clorox in it, we have kept chlorine tablets in it, and we have run our barracuda suction cleaning system for all day at times. What else can we do?!?