Thanks!! You are right about the bleaching, my wife just called me from the pool place and we had a FC reading of 10.. hooray. I'm going to check out your link and grab that test kit this afternoon.

I don't remember what our CYA reading was when closing the pool and our pool has a vinyl liner. Any suggestions on how to improve the performance of our filter? I replaced the original filter two seasons ago with a brand new one. When should I change the sand? This will be the third season with the same sand.

Once I clear up our problem what do I need to do on a weekly basis to keep the water clear? Sorry for all of the questions this will be our first time using liquid chlorine and I just want to make sure that I'm doing it right.