Excessive chlorine use

[302harrison]

Hi, guys. My pool has been using so much chlorine lately. I am putting in a full bottle of 10% bleach every day, which is costing us $80 a month. It has been super hot ( upper 90’s) and we’ve had daily swimming in the pool, but still. My CYA is 50. Should I raise it? Would this help? My numbers are:
Cya 50
Ph 7.5
TA 60
Calcium 280

 

[Richard320]

A full jug of 10% is adding 6.5 FC per day. You're right--- that is waaaaay too much.

I think your next step is to run the Overnight Chlorine Loss Test. You'll probably fail it.
50 CYA is plenty, and as high as you want to be for what will probably come after the OCLT.

Jack your FC up to 10 or 12 after dinner. Test the FC after the sun no longer hits the pool and after the last swimmer is out. Leave the pump on. Set your alarm and get up tomorrow before the sun hits the pool and test FC again. If you lost more than 1 FC, you've got algae starting somewhere.

 

[kimkats]

I would do an OCLT then think about pushing the FC up if the OCLT comes back good.

Perform the Overnight FC Loss Test (OCLT)

The Overnight Chlorine Loss Test tells if the SLAM is finished or if you need to start a SLAM. This article says how to do the OCLT.

www.troublefreepool.com

 

[302harrison]

Ok. Thanks. I actually did an OCLT recently to see if that was the problem and passed it, but I’ll do one again tonight.

 

[aussieta]

you dont mention what level you are maintaining your fc at
do you have young children who seem to never need to go to the toilet in your pool
do you have dogs swim in the pool

 

[302harrison]

I try to keep it at at least 3. Lately, it’s been down to two to four each evening. I add a bottle of 10%, and by the next evening, it’s down to 2-4 again, so it has eaten the whole bottle up. We have had kids swimming lately. They get out to use the bathroom, but you never know.

 

[borjis]

That is way too low FC for your CYA of 50.
That range is 4-8. Looks like you've been below the minimum quite a bit.

 

[mknauss]

I try to keep it at at least 3.

You are not maintaining your FC high enough for your 50 ppm CYA.
FC/CYA Levels

 

[302harrison]

Ok. Thanks! I will keep it higher.