Just go my shiny new test kit in and decided to check out the water. FC was 0, CC was 0, PH was 7.4.....decided to go ahead and check the CYA with the FC/CC being zero and it was well over 100. So, I doubled the sample and kept the solution the same(not sure if this was right but it seemed logical) and I was still only able to put 1/4" of water in the tube before the black dot was gone. I added 2.6G of bleach to the pool to see what kind of reaction I would get from FC/CC and it (FC) went from 0 to 1.5%, that was after 4 hours of the pumps running. The pool is 27000G, I really don't want to have to change 75% of the water! I was looking at my most recent report from my local pool place and they recommend your CYA being between 30-300....why so high?