I have a 16000 gal non-SWG pool/spa compbo with a 3 hp pump, sand filter and a Kreepy Krawly. I live in Arizona, so am dealing with continuous hot weather, often 105 F day and 90 F at night. I have been reading the forums for a while, and switched over to using bleach only in April of this year after I had to drain the pool due to very high (130) CYA readings. I started the season with a CYA reading of about 30, and added stabilizer to bring it up to 50, where it has remained.
Problem is this--the pool does not hold CL. I start my weekly maintenance cycle by backwashing and then adding 2 gal of 10% CL. At the same time I add 6-3" pucks of di-chlor to floaters. The initial 2 gallon dose of CLThis put CL above my test kit limit. When I add 1 gal 10%CL TC rises to about 4ppm. However, even with the 2 gal add (and the pucks) the CL drops to an un-readable level within 12 hours. So, I end up adding a half gallon of 10% CL every day, which gives me enough CL to get through a day, but the next AM I am back to zero. The only other chemical change I detect is that Ph drops quickly, so I am adding Ph Up or a similar product at least once a week.
I have a pool guy who comes and does chemicals and cleaning while I am away for parts of the Summer. He has started adding 3 more pucks, into one of the skimmer baskets, for a total of 9, but he cant get the CL to hold either..
I do get a lot of organic matter in the pool, but skim it regularly, and the Kreepy does a good job of cleaning the bottom. I test for phosphates, and am usually around 100. Any higher and I add PhosFree as directed.
Needless to say, in this heat I get green algae regularly. I hand scrub the irregular areas of the landscaping where algae hides, and brush the entier pool before using algaecide as directed (usually Yellow Gone, 2 lbs, followed by a CL shock), run the pump 24 hours, vaccum and backwash, and the pool clears right up.
I've read everything I can find, but I cant get my hands around this, despite spending a King's ransom on pool chemicals. Can anyone suggest why I can't get the pool to hold CL? I must be missing something. My pool guy Patio Pool and Leslie's have no answers. Thanks to all.