Combined chlorine test

ioinva

Active member
Jun 3, 2020
29
VA
I’ve been doing the DPD test this year and was excited to always get a zero or near zero reading for CC. Then we were away and I came back to a green pool. Zero FC and again, Zero CC. Added liquid chlorine to boost it to SLAM levels and read it overnight— water still slightly green in the morning with a .5 CC and swimmable FC. added more liquid chlorine — because despite the tests, there was a green tinge still. This morning, my FC is really high but my CC seemed low (1) again. Water is a perfect clean blue.

and as I’m sitting here with my coffee by the pool, the test tube turned pink, a few minutes later. Added titrating agent, it turned clear again. I repeated this process several times — now I’m at a Cc of 5, and the water again turned pink in the test tube while I was waiting…

so… was I really supposed to wait after titrating for CC and titrating again? Will it keep going or stop?
I assume I’m not done with the SLAM, but I’d like to burn off some of that Chloe.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,307
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
so… was I really supposed to wait after titrating for CC and titrating again? Will it keep going or stop?
Once a test is done to clear, dispose of the sample.

Having a low or no CC with algae in the pool is not unusual. Not all algae create the ammonia based compounds needed to create CC.
 
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