I recently recieved my tf 100 and love it. I've done the CYA test twice now and it reads 20ppm. i had 80ppm a month ago. we have only had one hard rain. and we filled the pool 3 times about 2-3" of water each time.
pool store says i have 54ppm and i know they dont do it rt but it cant be that far off can it?
when i read the test when do i consider the black dot gone cause i can still see it a little bit at 20 very very faint but i can see it.