Please help me as I don't know what to do to get the reading of chlorine in my new pool. It is about 24,000 gallon pool and no matter how much I shock, no chlorine shows up in the test. I even brought to Leslie for water testing and everything are great except zero in both FC and TC. The water is as clear as it can be so I don't know what else to do here.
Here is the result from Leslie:
Calcium Hardness - 240 (after added 35 lbs of Hardness Plus)
Cyanuric acid - 60
Total Alkalinity - 90
pH - 7.6
Total dissolved solids - 600
Phosphates - 100
My chlorinator works properly as I can see the tablets are being dissolved. I added 4 full cups of powder type shock a day after major rain, still no chlorine. Three days later, adding another 3 cups still showed no chlorine even after tested a few hours later. Should I need to add more? Just a month ago, that's all I need to add to get a good chlorine reading.
Is this possible that I have chlorine lock? Or there is no such thing? Could there be something in my pool that takes away the chlorine? Please help as this is very frustrated. Because of no chlorine, could it be possible that I see a few of black slimy look-a-like slugs in my pool recently? But it is another topic to discuss.