Seem to be using A LOT of chlorine

[AZCharlie]

Most recent test results:

FC 7
CC 0
Ph 7.4
TA 90
CH 250
CYA 50

The pool was just resurfaced with Mini Pebble on July 5th.

Have not started the SWG yet...

I lose 6-7 ppm of chlorine each day.

Is this normal for a newly surfaced pool in the AZ sun & heat?

Thanks in advance.

 

[mknauss]

That seems high. I can see 5 ppm loss when it gets really hot and we get wind storms.

Try a Overnight Chlorine Loss Test. That is pretty definitive to see if you have organics in the pool consuming chlorine.

 

[AZCharlie]

I was afraid it might be organics.

Perhaps the newly filled pool sitting untreated for 2 days before the PB decided to come back to add start up chemicals caused this?

I’ve kept a minimum of 4ppm of CL in it since he added start up chemicals...

 

[mknauss]

2 days here in SW desert I doubt would be an issue. But extended period with FC below minimum for CYA it is possible.

Run the Overnight Chlorine Loss Test

 

[AZCharlie]

I ran the OCLT last night & had 0.5 ppm FC loss...

That tells me I’m losing 5.5 - 6 ppm FC during the day...

Any ideas?

 

[mknauss]

Good.

I assume your CYA test above is a recent test. I would suggest you raise the CYA to 80 ppm when you start the SWCG.

We do lose CYA in our pools in June, July, and August due to extreme sun. I lose up to 15 ppm CYA a month. So be aware your CYA can drop some. But sounds like you have a high natural consumption of chlorine. It should go down with a higher CYA.

Be aware of degraded liquid chlorine. The heat here can effect it rapidly if it is stored outside. Source product that is either extremely fresh or stored inside.

 

[AZCharlie]

Will do.

Thank you very much!