I received my TF-100 a few weeks ago, excitedly did all my test and posted my levels for advice (thanks for everyone's help!). Before posting my CYA results, I did the 7065 control test to be more confident in my own CYA reading. I felt confident in my almost non-existent CYA result (tube filled entirely, could still slearly see black dot, but the water was a little cloudy). Per some suggestions to take it slow in raising my level, I added 4 lbs and tested again. I've gotten readings ranging from 20-30, however my readings with the 7065 test using replacement CYA reagent have been 35-45, so I've been a little skeptical of either my replacement r-0013 or my own ability to read the test since we're new at this. My 1st round of testing where the 7065 test was accurate and my pool water filled the tube are the only 2 times I used the included r-0013. My husband accidently dumped it a few days later, so we tested everything again once the replacement from Amazon came.
Since I want to get my CYA to a good level, and I'm lacking confidence in my own readings, I took samples to 2 different pool stores yesterday. Both places gave me readings in the 40s (42 & 44). If that's the case, then I don't want to do anything further and risk overshooting my CYA. But if my own novice reading is more accurate at 20-30 then I really do need to add some stabilizer.
I know pool store testing is frowned upon here, but in this case, with a subjective test that I've already had issues reading the control test accurately, should I go with the 2 similar pool store levels? Other suggestions? Anybody in central NJ wanna come out and do the test again for me?