Quote Originally Posted by CarlD
However, realistically, using Ben's kit, it frequently has a presence of less than .5--but unless you use the 25ml test (vs the 10ml test) you cannot tell if it's .2 or .4 or .5ppm.
Carl,

Are you just talking about using the same test kit and just changing the proportions? I don't think I saw that listed as an option in the instructions.

Lenny