Lisa:
Please start here:

http://www.poolforum.com/pf2/showthread.php?t=3833

then read this:

http://www.poolforum.com/pf2/showthread.php?t=1113

These should help a lot. If you cannot believe this all works, then go to:

http://www.poolforum.com/pf2/showthread.php?t=1180

This is where you need to start.