Overnight Free Chlorine Loss Test

[CraigSm208]

I realize to do the OCLT, I should turn off any chlorine source. Is it OK to leave the pump running all night for circulation or should I turn the pump off also?

Thanks

 

[linen]

Re: Overnihgt Free Chlorine Loss Test

As long as you give the chlorine enough time to mix (maybe and hour), you can do it with pump off, but you will want to be up extra early to get your pump moving the water a while before doing the morning test. IMO, it is better to just leave it on, but it doesn't have to be.

 

[CraigSm208]

Thanks, Linen. One further question. Usually I do the morning test for the OCLT before the pump has been turned on and before the water is circulating. Does that make my free chlorine test invalid?

 

[linen]

It could, since there can be localized consumption of chlorine.