afman

Test for Phosphates. If you have them you add a bunch of chlorine with little results. If the store can't test for it get a quart of phosphate remover and give it a try Thanks - phosphates have been tested for and where an issue early on, but removed 3 weeks ago...

I opened my pool about a month ago and it will not hold free chlorine. All other levels appear to be fine (I am having my water analyzed by a pool shop). The pool is approximately 23,000 gallons and I have added just over 20 gallons of chlorine over the past 2 weeks. The pool looks clean - it took a few weeks to clean up, but all green is gone. I had the same problem last year, about mid way thru the summer I "lost" all free chlorine and have not been ablr to get it back. The pool has a sand filter and I replace the sand prior to opening the pool. Any suggestions?