i do test my water everyday and add as i am suppose to, i think, i hope.. but when there is a problem and you have to shock and try to hold it at shock level until it clears...that's hard for me to do when i work. i can't test it 3 or 4 times a day and i guess that's where my problem is that i'm not holding it at shock level and i didn't get it completely clear before i left....i have learned that from you and the others on this forum...but i am trying and i do appreciate you bearing with me and my mistakes and in helping me get on the right track. thank you Carl D.