Just a little follow-up. As you told me, I switched to bleach. My PH is still at 7.4, my has dropped to TA=100, my CYA is now 70, my CH has dropped and is now at 150 and it is taking me around one to 1.5 qts of bleach per evening to maintain my free clorine at 5 to 6. I AM GETTING THERE!!