AnneH said:
In looking at the two recommended test kits (TF-100 and K-2006), the K-2006 does not have the OTO chlorine test. What do you need the OTO test (total chlorine?) for, if you can test the FC and CC? Thanks for the info...
The OTO test also never bleaches out. If FC is above the test range, it goes through shades of orange and brown. The DPD test can bleach out at super high FC and mislead you. You don't really need either of them with the FAS-DPD test, but
since they don't make a pH test block without FC on the other side, you might as well have the better one.