Thanks for your replies.
I have the TAYLOR K-2006 kit. I have been using the same kit since beginning of season. Adding two scoops of DPD powder (r-0870) followed by counting drops of reagent (r-0003). And I have done many successful FC tests so far. So I doubt I'm doing anything wrong with the testing.
Reading your feedback, I'm convinced that I have a crazy high chlorine level that I can't even measure (without wasting my reagent).
My CYA measured a week ago was 30. Sounds like that number may have doubled too.
I switched to a floating dispenser from adding daily bleach doses. And this was the first tablet I ever used. My floaty is a small one for 1inch tablets, but because I couldn't find any 1 inch tablets in stock, I purchased a 3 inch one and broke it into small pieces and put all of the pieces in to the floaty.
I guess my mistake was relying on the smallest setting of the floaty to dispense just enough chlorine to my tiny pool. After 3 days, only about 1/3 of the 3" tablet remains undesolved in the float. I took it out of course now.
James - I will try the distilled water trick to measure exactly what my FC level is and go from there. What sample size should I use of the 2to1 mix, so that each re agent drop counts as 3? 10 ml or 25 ml? (based on Taylor's FAS-DPD method)
Is hydrogen peroxide safe to use in the pool? Should I try that instead of dumping half of my water and refilling?
Thanks!