Can somebody plese help me on test tube viewing. I do what the instructions say to do,but i can't really tell when the dot is really disappeared. Should the solution be completely white,or what. Pool calculator said to dump 50% of water,which i did,but cya is still around 70 or 80. I can't believe the cya is still around 70 after dumping that much water. Any help will be most appreciated. I will surely remember you in my nightly prayers. THANKS THANKS THANKS