Quote Originally Posted by Rangeball
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-



True or false?

My color never changes no matter how long I read it. Going by this, I have no CC.
This will only work if you have a LOT of CC in the water. It is really not useful at all. If you have enough CC to show with this method of OTO testing you will already know it by the strong chlorine smell and the burning eyes. I stand by my statement that OTO only tests TC! You cannot accurately get a FC reading with it. This is why most health departments ( or is it all now?) only allow DPD or FAS-DPD testing of commercial pools.