I am running the filter 24/7, I do have some skimmer socks but have not used them yet. Obviously the theory is that the minute stuff that gets thru the socks is then trapped by the filter,those are some tiny particles. I am going out for my evening reading now, unfortunately I have to work tomorrow so will test early and add CL to get it up to 12-15 during the day. I also saw somewhere that CYA is quite acidic so that must be why my PH has dropped to 7 from 7.4. I will also bump that up and post my numbers if anything seems outa whack. Thanks again.