High Free Chlorine

[Mkstretch]

Hi guys! My FC is 8.6 and was wondering if their is anything I should do to lower it back down to 4 or 5? I did turn down my chlorinator a little bit.
maybe I should run the chlorinator longer hours at the lower setting to bring it down?

 

[jimbethesda]

Hi, and welcome to TFP! How are you testing your water? Pool store and test strips are not accurate. You need a TF-100 or Taylor 2006c test kit.

Assuming your value of 8.6 is correct, in order to say if 8.6 is too high, we need to know what your CYA (stabilizer) is. It’s safe to swim up to SLAM level of FC. See the chart below.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

 

[Mkstretch]

Hey Jim! I’m using Taylor 2006. Only thing I couldn’t test was CYA, because I ran out. CYA Should be delivered tomorrow.

 

[jimbethesda]

Hey Jim! I’m using Taylor 2006. Only thing I couldn’t test was CYA, because I ran out. CYA Should be delivered tomorrow.

Ok, good. Still can’t recommend any change to FC until you test. What was it last time you tested?

 

[Mkstretch]

Ok gotcha. It was 70 last time.

 

[jimbethesda]

Ok gotcha. It was 70 last time.

If you haven’t added any, it won’t be any higher. If you haven’t drained any of your pool, it shouldn’t be much lower. The short answer is given a CYA of 70, you can go lower than 8.6. Just follow this chart.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

 

[Mkstretch]

Ok so today my FC is 8 and my CYA is about 55

 

[JoeSelf]

CYA numbers are in tens. 50, 60. Scale is not linear. If you are between always round up to next tens place.

 

[Mkstretch]

CYA numbers are in tens. 50, 60. Scale is not linear. If you are between always round up to next tens place.

Ok. Thanks