CaryB is right, anything you do now is only a guess. If you are serious about properly taking care of your pool, dump the "guess" strips and get a good drops based test kit. Needless to say, around here we all prefer the PS234 sold here http://www.poolsolutions.com/cart/kits.php however Taylor makes similar kits for a little more money. Be sure you get a FAS-DPD test for chlorine. At the very least, get the $15 Wal-Mart 6-way test kit but beware that it will not test for chlorine above 5ppm.

Dave