Total and Combined Chlorine?

[Rick8896]

Hi Can someone please explain the difference between Total and Combined Chlorine? And which one do I enter in PoolMath.
Thanks

 

[ajw22]

In PoolMath under Test Results you can enter Free Chlorine and Combined Chlorine. Total Chlorine would just be adding the two which we don’t care about.

I suggest you read ABCs of Pool Water Chemistry

 

[YippeeSkippy]

Free Chlorine is the chlorine ready to go to battle...the stuff that will kill the cooties.

Combined Chlorine, aka Combined Chloramines, are the cooties....sort of the count. Ideally you want zero, but 0.5ppm is acceptable also. Anything higher than that is cause for concern.

Total Chlorine is just the FC + CC. It means nothing and is of no use knowing

Maddie

 

[RMcGirr83]

If using a Lomotte tester, your choice is free chlorine and total cholrine. For the app, and to input combined chlorine, you subtract your total chlorine "score" from your free chlorine score in the Lamotte tester to enter in your combined chlorine in the app. As @YippeeSkippy said you want the combined to be close to 0 but no more than .5. You can view my pool logs and see what mine have been.

 

[Rick8896]

Thanks guys. I'm going to buy a new test kit. K-2006 says it test Total and Combined Chlorine. The TFT says Chlorine FAS/DPD, Combined Chloramines and Chlorine OTO. I have read ABCs of Pool Water Chemistry. I understand the differance now. Can you tell me which one is free Chlorine.

 

[mknauss]

The FAS-DPD test kit will give you FC and CC. The K2006C or the TF100 both have the test in them. The TF100 is a better value for the residential pool owner.

 

[Rick8896]

What is the Chlorine OTO test that TFT does?

 

[YippeeSkippy]

The OTO test is the small comparater block that you add the five drops of red stuff to. It only tests up to 5 or 10ppm FC, depending on the kit. But it doesn't give you the CC reading. Only the FAS-DPD test does that.

 

[Rick8896]

Thanks everyone