LOW PH FROM STABILIZED CHLORINE

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
rongold
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My Pool: 40 year old Esther Williams 16 X 30 above ground. Hayward EC-40AC filter

LOW PH FROM STABILIZED CHLORINE

Postby rongold » Sat 27 Apr, 2024 17:54

Hi all,

I know that using stabilized 3" tri-chlor tablets drags the PH down. Is the only way to counteract this is by adding PH up powder, or is there some other way ???

RON


Denniswiseman
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My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: LOW PH FROM STABILIZED CHLORINE

Postby Denniswiseman » Sun 28 Apr, 2024 01:21

Aeration will raise pH only

Excessive CYA renders your chlorine ineffective and you have to use more to get the same sanitation
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
To reduce your CYA you have to do a partial drain and refill
Continuous use of Trichlor/Dichlor will raise your CYA which means you have to raise your chlorine level as well
Teapot1
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Joined: Thu 29 Apr, 2021 00:43
My Pool: 12000 gallons vinyl liner,

Re: LOW PH FROM STABILIZED CHLORINE

Postby Teapot1 » Sun 28 Apr, 2024 02:12

Hi Ron, it depends a lot on the other parts of your water. The pucks generally end up pH neutral as the CYA is somewhat balanced with bicarb and chlorine. To give you the best information we would need the results of a water test and not from dip strips but titration or digital tester. These would include; calcium hardness, total alkalinity and CYA level, together with chlorine level and pH. There are things in the water to buffer pH changes like alkalinity from bicarbonate of soda and to a lesser extent calcium. If you can report back then we can take a look. Aeration is another way of bringing the pH up but again it can effect other things so more test results first. Also what type of pool is yours, vinyl, glassfibre, tiled, plaster etc.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
Teapot1
Pool Industry Leader
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Posts: 1248
Joined: Thu 29 Apr, 2021 00:43
My Pool: 12000 gallons vinyl liner,

Re: LOW PH FROM STABILIZED CHLORINE

Postby Teapot1 » Sun 28 Apr, 2024 02:13

Morning Dennis, how are you, long time no speak?
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2602
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: LOW PH FROM STABILIZED CHLORINE

Postby Denniswiseman » Sun 28 Apr, 2024 02:53

Hi John, I'm as fine as can be.
I've been keeping an eye on the site but you seem to be on the ball, so no input necessary.
Teapot1
Pool Industry Leader
Pool Industry Leader
Posts: 1248
Joined: Thu 29 Apr, 2021 00:43
My Pool: 12000 gallons vinyl liner,

Re: LOW PH FROM STABILIZED CHLORINE

Postby Teapot1 » Sun 28 Apr, 2024 12:41

Haha I was thinking I may not be giving you a chance! Dont worry I will be away for a couple of months very busy so hopefully you can assist people.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.

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