Just tested pool with new TF-100 kit from Dave
I am scared or confused!
Chlorine Drop 60 drops of reagent - solution never turned pink after R-870.Stayed yellow. No change after 60 drops of R-871.
T/A After 30 drops R-009 no color change.
CH After 25 drops R-0012 did not change to blue
CYA 100+ or more
Either I am an idiot or this pool ( clear and sparkling) but with stain or etching in the bottom and sides) is really in trouble.
FNS DE filter
@ hp Hayward pump