K 1000 versus TF 100


Jun 3, 2017
Felton/ Pennsylvania
Why is it when I check my FC with the K-1000 kit it will give me a reading on the first drop and by the 5th I’m at 10ppm but when I check with the TF-100 kit witch it tells me I’m at only 2.5 my goal here is to be 5ppm. Just Wondering why the K1000 shows are reading on the first drop.


TFP Expert
LifeTime Supporter
Jun 12, 2009
NW Ohio
OTO isn't especially reliable.

That said, the OTO tests total chlorine. Are you testing FC and CC with the FAS-DPD?
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