A couple of questions on this testkit. I noticed the description of the Combined Chloramines test says it can measure CC's down to 0.2 ppm. I was wondering how to achieve this measurement? The instructions say to add 5 drops of R-0003 after the FC test. If it remains clear there are no CC's (0 ppm) but if it turns pink to add a drop of R-0871 and when it turns clear to multiply by .5. So a minimum of one drop would be 0.5 ppm. Am I missing something?
Also, how reliable is the CYA turbididty test. I can never get that black dot close to disappearing, but when I take it to the pool store they tell me my CYA is 80. Is it possible to have a bad reagent?
Thanks in advance.