I believe watermom answered my question about SI in another thread ... not to worry then.

BTW, I love the Taylor test kit ... like the chemistry set I never had as a kid! I even got a guy at work to look at buying one; told him to sign up for this site and follow the link.
One thing though - as accurate as all the measurements are, the "dipper" confuses me. There could be quite a variance between each dipper full, so does the amount actually matter to the outcome of the test or is it just matter that the water changes color? I believe I even saw someone post that they only used one dipper. Also, I am still getting the hang of it and think I went one drop past it turning clear once ... does that effect the CC test? I can see running out of DPD powder and CYA reagents first.