I have two different test kit both use the black dot, one is from the start of this year the I purchased a week ago I also purchased a test strip kit. I added the stabilizer the same as I always do, I put the pump on recirculate and dump it in the shimmer. I leave it on recirculate for 24 hours before putting back on filter. Even though I have been slowly adding stabilizer since May, plus I use trichlor pucks so I should be getting CYA from them also. I don't have any algae in the pool even though my chlorine reading is 0. I have been adding bleach to try and keep the chlorine level up enough to keep the algae from forming. I tried shocking the pool heavily for a week but that didn't help. I thought just maybe I had to much CYA in the pool so I took some of the water and started diluting it but nothing changed.

vanman2501