Thanks for your reply. I have well water and I have read to have it tested. Could I trust the pool store results? Where else can you have water tested? The filter system is BaquaPure 2600 filtration. 7 way multi-port valve, 200 lb sand media,26" baquashield filter. leisure tab 14lb.pool breeze shock treat and super pool breeze copper algicide. Also a 2.5 dual speed pump. the low setting is 1/2 horse power. I have learnt alot, but withour putting it into practice yet I am gettting chemicals confused. It was suppose to come with a baquacil start up kit, but I said no and was able to get other fun things instead. I think I did the right thing. Sharon