Ok guys - and gals. Got my TF-100 kit today. The kit I've been using was from Leslies, and used Taylor chemicals, but was just a DPD test, so I couldn't measure Chlorine above 5.
Anyway, here are the results:
TA 270 with TF-100, or 140 with Leslie's DPD test kit!
The thing that confuses me is the TA reading. The Leslies in-store test, and my other kit with the same Taylor R-006, R-007 and R-008 chemicals, read 140 for the TA. Same type of 25ml vial, same chemicals. I've been testing TA for 16 years. Dropwise until it changes from green to red.
Why would the new TF-100 kit take 27 drops, versus 14 for the other kit? Reagents appear to be the same. I've had the other kit since late last year, but its been stored in the house, in a dark place.
Anyway, the other confusing thing is that the pool store measured a CYA of 60. Based on that, I did a 1/3 water change several days ago, and today, I ran the CYA test with the TF-100 kit, and still read 60? I think there could be some margin for error, but I couldn't see the black dot through the cloudy water, at waist level, and I ran the test twice.
For now, based on a CYA of 60, rather than the 34 I thought I was at (based on the prior pool store reading with a 1/3 water change), I've boosted my shock level to 16. Water has been clearing, even with a level of 12 that I was keeping it at. I can see the bottom of the deep end for the first time in a week. Water is somewhat cloudy still, but its on its way.
Any advice is appreciated.