Chlorine Reducer

mkmscr · Sep 6, 2019

A service tech has been servicing my pool for the last few weeks since it’s a new pool. They want to own the chems for the first 30 days while it cures. I know my way around pools thanks to TFP the last few years. I measured my free chlorine last night and it was up around 8ppm. So, I told the pool company to watch how much chlorine they’re dumping in, especially before the weekend because it’s making it uncomfortable to swim. So, they sent a tech out today and added Chlorine neutralizer. Which is annoying because it would have lowered in a day or two if I killed the chlorinator but whatever.

My question is, how much will 8 ounces of this chlorine neutralizer reduce FC in a 15k gallon Gunite pool? I’ll get my trusty Taylor kit out tomorrow morning when I’m home but I’m hoping this doesn’t wipe out my chlorine entirely. Thoughts?

mknauss · Sep 6, 2019

Most likely it was sodium thiosulfate.

In your pool volume, 8 oz should drop it about 4 ppm. It would have dropped that much on its own in a day or two.

Is there no CYA in the water? 8 ppm FC is not high at all.

mkmscr · Sep 8, 2019

mknauss said:
Most likely it was sodium thiosulfate.

In your pool volume, 8 oz should drop it about 4 ppm. It would have dropped that much on its own in a day or two.

Is there no CYA in the water? 8 ppm FC is not high at all.

There’s 60ppm of CYA but it worked itself out. You were right, it was at about 5.5 when I got home.

JamesW · Sep 9, 2019

8 ppm is not high with the cya at 60 ppm. It certainly wouldn't be uncomfortable.

What chlorinator do you have working now?

YippeeSkippy · Sep 9, 2019

I'd be more suspicious of the pH making you uncomfortable rather than 8ppm of FC. A new pool's pH notoriously goes up frequently as the plaster is curing and pH problems certainly can be irritating.

Maddie :flower:

thefloatqueen · Sep 10, 2019

I’ve always been told there is no way to reduce chlorine levels other than time and sun exposure. Someone please correct me if I’m wrong.

mknauss · Sep 10, 2019

There are chemicals that can reduce chlorine levels. They are not needed in nearly all circumstances.