I have a 28,000 gallon in ground pool. I have a salt generator and I've finally got the water clear but it will not hold chlorine for over a day or so. I've shocked it too many times to count with very expensive bioguard super soluable recommended by the pool store. I have gone through over 100 lbs of it at a $170 for 25lbs. The pool store is draining my wallet dry. That's why I've turned here to trouble free pool to try the bbb method. I've cleaned Aldi out of bleach lol. I have purchased a Taylor K-2006 test kit. I've got my ph back to 7.4 is was below 7. My cya level is very high over 100. What can I systematically do go break the so called Chlorine lock. My wallet is getting thinner and my frustration is getting fatter. Please help.