Chlorine being used up but not showing CC

surfbabe

Well-known member
Sep 23, 2015
137
Austin
I'm just SLAMming the pool.

CYA tested at less than 30ppm (it was perfectly clear) and so I added about 14ppm bleach. After the first hour, there was a small reduction in FC and CC was .5.
An hour later, FC was at 12ppm but no CC showing
Added more bleach about 4ppm
Now, 2 hours showing at 12ppm FC but no CC

Huh?
 

pabeader

LifeTime Supporter
TFP Guide
May 14, 2015
4,349
Cartersville Ga
It's very common. CC's are reduced by the sun and the FC. So you are doing fine there. I would defiantly say you need to get some CYA in there right away.
 

surfbabe

Well-known member
Sep 23, 2015
137
Austin
really?

on the original thread where I queried this and whether the r0013 reagent had stopped working, I was advised to assume 30ppm. When I tested the water last, a few months ago, cya was at 55ppm. We have not had significant rainfall over this period.
 

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