Ok, First off let me say thet this site and Pool Doc and Water Mom and CarlD you are the best , the absolute best. I did exactly what you all said to do and Bingo....my pool is CRYSTAL CLEAR, the water feels great...and best of all I have held my chlorine level for 2 days now!!!!!!!!!!!!! THANK YOU THANK YOU THANK YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!