I'm new to pool ownership/maintenance. The local pool store sold me a 2.0 hp pump for my 15x30 ag oval pool ~ 13,000 gal with sand filter. I've been reading that this is probably too much pump force and doesn't allow the sand in the filter to actually filter the water. I have cloudy water, PH = 7.8, Alkalinity = 120, total chlorine and free chlorine low, hardness high. I shocked it and CL rose to .4 over night. They keep telling me i need more of this and that and not one thng has changed the cloudiness At ALL. I'm thinking of getting a smaller pump- any recommendations about the pump or the cloudiness.