Combined chlorine

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
15,789
Bedford, TX
J,

What kind of spa do you have? Is it built into the pool or a standalone fiberglass spa?

Please fill out your pool's signature...

Thanks,

Jim R.
 

Oly

Gold Supporter
Jun 28, 2017
1,221
Fresno, CA
High CC is an call for corrective action. Some of the things that will lower CC are removing the spa cover to expose the water to the air and sunlight, clean and or replace the filter, a partial drain and refill and regularly draining, purging and refilling your tub with fresh water. How much use does your tub get and how often do you replace the water?
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
15,789
Bedford, TX
Jerry,

I use the CC level to remind me to change the water... It is normally .5 or less, but when I find i can't keep it below 1.5, the water is replaced. I have a saltwater spa and normally do not have to do anything but add tiny bit of acid to keep the pH in line. As the water gets older I have to start adding a little liquid chlorine. My spa is only 200 gallons, but it takes about three to four months for the water to go South..

When was the last time you replaced the water?

Thanks,

Jim R.
 

JamesW

TFP Expert
Mar 2, 2011
17,372
Spas tend to get a buildup of various weak oxidants that register as combined chlorine, especially when you have an ozonator.

I'm not sure what all of the products are. Maybe chlorates, bromates etc.

In any case, if the CCs become persistent and won't go away, it's time for a water change.

Use a cleaner like Ahhsome if you think that it's necessary.
 
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jfkolar

Member
Aug 5, 2019
7
Cleveland Ohio
on Tuesday I had to add some water. Before I did I washed off the ring with some Natural Chemistry Clean and Perfect. After adding the water I added a little gentle spa, and some dry acid to lower my TA and turned on the jets to bring my PH back to 7.6. Had some bubbles so I used 2 Tbls. Of no chlorine shock. That explains the difference, thanks
 

jfkolar

Member
Aug 5, 2019
7
Cleveland Ohio
Jerry,

I use the CC level to remind me to change the water... It is normally .5 or less, but when I find i can't keep it below 1.5, the water is replaced. I have a saltwater spa and normally do not have to do anything but add tiny bit of acid to keep the pH in line. As the water gets older I have to start adding a little liquid chlorine. My spa is only 200 gallons, but it takes about three to four months for the water to go South..

When was the last time you replaced the water?

Thanks,

Jim R.
Water was changed 3 weeks ago
 

Backcountryski

Well-known member
Aug 31, 2019
46
WA
on Tuesday I had to add some water. Before I did I washed off the ring with some Natural Chemistry Clean and Perfect. After adding the water I added a little gentle spa, and some dry acid to lower my TA and turned on the jets to bring my PH back to 7.6. Had some bubbles so I used 2 Tbls. Of no chlorine shock. That explains the difference, thanks
The no chlorine shock is likely reading as CC's in your test. Wait a day or two and test again and see what you get.
 
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