Last year, I had all kinds of problems with my pool water. From this forum, I figured it the problem was caused by a high concentration of CYA. When I opened the pool this spring, I drained approximately 3/4 of the water and refilled the pool from my well. I initially shocked the pool with 1# of Shock that morning. I then took a sample to a pool store and everything tested normal. The next morning, I shocked the pool again with 4 gallons of 8.75% bleach. I am using 3 99% trichloro-s-Triazinetrione tablets in a floater. Can someone refresh me on TFP scheduled maintenance? My pool is 16 x32 w/deepend (+/-10,000 gallons), a 1 hp pump, and 200# sand filter, which I just had the sand changed two months ago.