Hi I'm new here and raising grand kids I have about 4 yrs left and we've been trying to get out 15' x 48" round and we have a 0.18 horse sand pump and we just can't seem to get our pool to clear up it staying cloudy, it was turning green but we used a package of shock treatment and got that cleared but it staying cloudy and we have to backwash everyday and so.... we need help please