Pool-in ground gunite, 10-12,000 gal, Triton II sand filter & Centurion 1.5 hp pump. I am going thru chlorine tablets like crazy when in the past summers it would only take approx. (1) 3" tab per day in a floater-now I am using two floaters and approx. 2 chlorine tabs/day per floater and still can not keep the chlodine level up to 1ppm. In the past a 40 lb bucket of 3" chlorine tabs would last 3 months and now I have gone thru one bucket in 1 month. I had my Cyanuric Acid checked and it is about 120. I also am having trouble trying to raise my PH above 7.2 (water at tap is 7.2) and have dumped several boxes of Mule Tide as suggested over a wk with highest reading PH at 7.4. We are on water restrictions in West Tx and can not drain the pool or even drain half to lower the CYA to a more acceptable level but I am not sure that will cause the high chlorine usage? I have also been using some bleach to try to keep from using so much chlorine tabs.