Quote Originally Posted by waterbear
OTO only tests TC. It will not give you any kind of accurate reading for your FC
I emailed the kit manufacturer asking if their kit did in fact test for FC and TC, as they claimed, and if they were separate tests. Got this response-

It is not a separate test.

For a free chlorine reading, within 2-3 seconds after putting in the oto drops, compare the color in tube.

For a combined chlorine reading, wait 1-2 minutes after putting in the oto drops and again compare the color in the tube.
True or false?

My color never changes no matter how long I read it. Going by this, I have no CC.