Most of the time when I test for Cl I use the 10 ml sample size, 0.5 ppm per drop. When you add the DPD powder to the 10 ml sample should you use 1 scoop vs. the 2 scoops used when you use the 25 ml sample? Also, do you still use 5 drops of the reagent with the 10 ml sample when checking for CC?