I have a 18 foot round with 52 inch walls by my calculations I have 7600 gallons with a cartridge filter. I filled it the pool up with well water. I feel like such an idiot. I have no idea [Edited by JohnT] what I am doing. They gave me a bunch of chemicals when I brought the pool. Anyway the pool water was fine and then I threw a couple of chorline pucks in the floatable thing. The water turned a little green. So then I figured I would throw some shock in. I did test it and the PH. is like 7.2 and the chorline was good. Then I went to work came home tonight and tested again and the chrorline is gone. Yes I figured out the sun disolves it. I kept reading about CYA and could not figure what this was. Then I read one of the bottles and it had CYA in it, Anyway I dumped that in. I am curious to see what the morning brings. I guess my question is should I let the filter run all night. I have had it running most of the day and evening since I got home from work. Also moving forward how many hours a day should I run the filter? Also what other steps should be doing if the water does not clear up. I live in NJ and the neighbors do not open the pools till the end of the month till Memorial Day. Also is it okay to leave those chorline pucks in the skimmer. My brother told me to stick a couple in there to get the chorline in the system quicker? Thanks[fade]