Chlorine Consumption

[Redelephants]

I'm averaging about 3-4ppm of chlorine consumption, daily. I live in sunny Florida with daytime temps reaching 95+ with no shade. I'm a new pool owner and have used the BBB method from the beginning. My pool (15000 gal) is plaster without SWG. My water is crystal clear and I'm losing ~1ppm with oclt. My recent readings are as follows:

FC: 3
CC: 0
Ph: 7.8
TA: 90
Ch: 230
CYA: 30

Is 3-4 ppm FC typical, given the above? I've been dumping 60-75 ozs per day of 10.5%.



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[Texas Splash]

Hello and welcome to TFP! In the summer, we like to see FC loss that does not exceed 4 ppm in a 24 hr period. You're right on that border, and given the fact your CYA is a bit low (in my opinion for FL), you could probably increase CYA to 40-50 very easily and save more FC. As long as your OCLT does not exceed 1 ppm, you should have no concerns with algae, so increasing the CYA would be the next logical step. Hope that helps.

 

[Redelephants]

Thanks for the quick reply. Guess I can throw in a few tabs in my chlorinator to gradually raise CYA. On average, how many PPM of CYA is added by a typical 3" tablet?


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[Texas Splash]

It can vary based on flow rate and type of tab. The Poolmath calculator has a tool at the bottom (Effects of Adding Chemicals) that helps with that. But in general, you can estimate each tab will increase CYA by around 7-9 ppm.

 

[bobodaclown]

Welcome. There are different factors, bathing load and sunlight are just two of them that will affect chlorine usage. I think you you may be on the edge of an algae bloom. 70 oz of bleach will raise your FC level by 4. You're at 3, it should never go below 2. I would recommend to SLAM, as insurance, nip it early if an issue, you shouldn't have a 1 ppm loss during the night. (No sunlight to break down the chlorine, it must be fighting something.) This is one of those times it's better to run a little higher than lower.
Enjoy the water.