How can TC be less that FC

[CarlD]

Didn't I just say that????

Actually, Evan gave you the details--i thought DPD bleached at 15, he says 10. Doesn't matter, I no longer use DPD and don't recommend it--I use OTO or FAS-DPD.

The BEST OTO kit I've ever seen is Ben's PS-200 included in the PS-233 kit. It uses Taylor R-0600 for OTO and R-0014 for pH and the Taylor small cell (as opposed to the big one that was in the PS232) and works better than the other OTO kits I've used. It goes to 5 on TC (which is better than 3).

I presume other kits that use these same 3 items are interchangeable.

I haven't noticed a significant difference between any of the FAS-DPD tests.

[adl6009]

Good information, thank you. I ordered my 234 test kit after reading it. I also got the vac head, looked like a step up from my old hayward round head.

[waterbear]

Didn't I just say that????
Yes, you did. I was just giving the details!
Actually, Evan gave you the details--i thought DPD bleached at 15, he says 10. Doesn't matter, I no longer use DPD and don't recommend it--I use OTO or FAS-DPD.
Taylor and LaMotte both say at values over 10 ppm.
The BEST OTO kit I've ever seen is Ben's PS-200 included in the PS-233 kit. It uses Taylor R-0600 for OTO and R-0014 for pH and the Taylor small cell (as opposed to the big one that was in the PS232) and works better than the other OTO kits I've used. It goes to 5 on TC (which is better than 3).
Gotta agree here!
I presume other kits that use these same 3 items are interchangeable.
Pretty much. the comparators and the reagents are the same. I know the Taylor K-1000 is the same and I think the Leslie's branded Taylor kit is the same.
I haven't noticed a significant difference between any of the FAS-DPD tests.

Can't comment on the last since I have only used Ben's and Taylor's. Only difference is the size of the spoon for measuring DPD. Taylor's is smaller but they say to use 2 scoops instead of one.