Hi, apparently when I did the CYA test, I could not get the black dot to disappear. This test has always been difficult for me even when I had the HTH 6 way test kit I could not get a reading. But at Leslie's they are consistently getting 30. Can you please tell me how to read it, the black dot on the bottom is not disappearing. As a result I went to add some chlorine puck to pool using the little white and blue floater and the tablets fell on the bottom of my pool (help, how do I remove it, I can see it, but the water is not safe for me to get in to it right now). Will the tablet tear the liner (the liner is only 3 years old)?