I had originally started using the 1" tablets in the filter and there was never any chlorine reading on the test strips. I did try and shock the pool about 1 week ago but that still didn't produce any chlorine readings on the test strip. I also used some pH down one day last week and that didn't seem to help either. I did purchase one of your recommended test kits and here are my test results.
FC - .5
CC - .5
pH - above 8
TA - above 300
CH - 390
CYA - 0 (still could see dot at 20)
The daily test for chlorine was 0.
The water looks nice and clear - and it has only been filled for about 10 days. However, I have noticed a few backswimmers in it. I killed about 4 yesterday and 3 today so far. Should I just start over with the directions in pool school?