Eating up a lot of chlorine

survivalcar

Well-known member
Jun 9, 2018
56
Northampton, MA
Hi guys -

Thanks in advance as this forum has been an incredibly valuable resource to me in the past.

My pool has been taking ~90+ fl oz LC (12.5%) some days recently as the summer heat gets on it. I've had to SLAM in the past and I'm concerned about the CYA getting so high that it's unmanageable. It's a vinyl pool and at the moment the CYA is (I guess?) around 37.

I had been trying to keep my LC between 5 and 7 based on this Chlorine / CYA Chart - Trouble Free Pool and it's been fine but after some of these long, hot days, I come out and the FC is around 3, thus requiring a lot of LC. The CC is 0.

Should I up the CYA so that I'm not pouring almost a whole gallon of chlorine in there every day?

Thanks
Chris

FC (today) 3.75 - raised to 7 w/97 fl oz of LC 12.5%
pH 7.6
TAC 70
CH 750 (I think?)
CYA 37
CC 0
 

survivalcar

Well-known member
Jun 9, 2018
56
Northampton, MA
Please confirm first what test you are using. A CYA of 37 is an unusual number.
I'm using the real test - the Taylor FAS-DPD. I'm guessing 37 because it looks a little under 40. I've written on here about how I have a notoriously hard time reading the CYA test. Depends on the time of day, the angle of the sun, probably also how tired my own eyes are lol
 

Kevinr14

Silver Supporter
Mar 8, 2021
296
Chandler, AZ
Pool Size
15000
Surface
Plaster
Chlorine
Liquid Chlorine
You've got a large pool so you'll be using a lot of LC. I have a 15,000 gallon pool and using around 60 to 70 ounces of 10% chlorine a day at a cya of 60. Though I'm in Arizona with full sun on the pool for about 9 hours.
 

Jesusfreak

Well-known member
Jun 5, 2019
90
Denham Springs, LA
Pool Size
26000
Surface
Vinyl
Chlorine
Liquid Chlorine
Is 2 gallons/day LC normal for a 26,000 gallon pool? I ran out of my CYA Test chemical today. Best I can tell is it is low. Should I switch to trichlor tablets? The pool is not being used much, as I am not home but a day or two /week.

It is very hot and humid and my pool sees full sun. Thank You.
 
Last edited:

BowserB

Silver Supporter
Jul 29, 2018
657
"Old" Katy, TX
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Is 2 gallons/day LC normal for a 26,000 gallon pool? I ran out of my CYA Test chemical today. Best I can tell is it is low. Should I switch to trichlor tablets? The pool is not being used much, as I am not home but a day or two /week.

It is very hot and humid and my pool sees full sun. Thank You.
If you're sure your CYA is low, then trichlor tabs will work for you. Just be sure to check when you get resupplied with CYA reagent, as it's harder to get CYA down than to get it up. I see you're in Denham Springs. I grew up in Baton Rouge. Your climate is nearly identical to ours in the Houston area (hot and humid most of the year; cool and humid the rest). We just added a SWCG very recently, but previously we used tabs in a floater in the spring to bring up the CYA, then switched to liquid chlorine once the CYA was at 40--although I was planning to go to 50 this year. The great chlorine scare of 2021 pushed me over the edge toward SWCG. Check back with me in three years, and I'll give my opinion on whether that was a smart move!
 

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