I left my TF-100 test kit out all winter, can I trust the CYA test?
I just tested for the first time this year & filled the tube all the way & it did not obscure the dot at all.
No chlorine loss over night & no CC's.
I was expecting the level to be 40 like last year, but it has been 10 months of rain since last year.
I have been keeping the CL @ 7 like I had a CYA level of 40, but I have been l dropping to 3 after 8 hours of cool overcast weather, that is what made me test for CYA
My question is, should I add enough CYA to get me to 20 while I wait for more reagents?