Quote Originally Posted by buki5 View Post
Reran the FAS-DPD test at the 25ml mark, again using 2 scoops of 0870 but this time the color is very light pink and I go clear at 50 drops which should be 50*.2=2.5ppm.
I think it says to add another scoop until it turns red...? also 50*.2 = 10