High Alkalinity

Stonesphan

Member
May 10, 2021
12
Phoenix, AZ
So just got the TF - 100 over the weekend and this is my second set of test results:

FC: 8.5
CC: .5
pH: 7.8
TA: 250
CH: 575
CYA: 100
TEMP: 90
CSI: .99

Big question is I know that TA is affected by high levels of CyA. So should I be dropping the pH really low and really dropping the TA or is the high level of CyA affecting my TA readings and its not really that high?
 

Newdude

Gold Supporter
TFP Guide
Jun 16, 2019
10,384
NY
Rerun the TA test. It’s wonky at first for a lot of folks. The bottles get static charged in shipping. It takes a few rounds of tests to lose it.

go slow. Bottle fully upside down. Gentle squeezes to let gravity make perfect, repeatable drops. Wipe the tip with each drop (y)
 
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wireform

Silver Supporter
In The Industry
Aug 15, 2017
2,788
Spring Valley, NY
As New dude said, new TA regents suffer from static and the drops may be smaller then it should be thus making the count go higher then actually needs to be. Just to add to what was said is: for the first few tests between drips turn the bottle right side up and wipe the tip with a moist paper towel and then go it again perfectly vertical helping the droplets ever so slightly that it drops off on its own.
 
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Stonesphan

Member
May 10, 2021
12
Phoenix, AZ
I did wipe the tip in-between drops, I will see about trying to get nice full drops, but this is my second test and the first was pretty much the same, showing TA of over 200
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,016
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
As noted above, give the TA test a couple more runs to ensure you are getting good drops to form for an accurate TA. Yes, once the pH hits 7.8 - 8.0, use enough muriatic acid to lower the pH to about 7.0 and that will lower the TA each time.

The big issue is your CYA. It's not effecting the TA, but it does require more FC. It's difficult to manage a pool with a CYA at or over 100. So before you waste too much chemicals treating the water, you might consider exchanging some water. An ideal CYA for you this time of year might be around 70 or so. If you decide not to change water and ride a higher FC level, remember that an FC that creeps over 10 will start to influence the pH. That, combined with locally hard water and an ever-increasing CH level, will be important to avoid scale.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
43,651
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
To answer the question about CYA and TA. Part of the TA is cyanurate alkalinity. Roughly 30% of your CYA level is added to TA. So as Pat said, you need to get CYA under control, then TA will manage itself by controlling pH.
 

wireform

Silver Supporter
In The Industry
Aug 15, 2017
2,788
Spring Valley, NY
Inorder to know what to do and how to do with the CYA you need an accurate CYA test. If you suspect CYA around 100 thats where this test tops out and you won't know if your over the 100 and by how much. You need to do a diluted CYA test and then multiply the results by 2.
 

Stonesphan

Member
May 10, 2021
12
Phoenix, AZ
Thanks for the feed back. I'm stuck with the CyA levels until I'm able to drain this fall. Just trying to get through this summer so that I can drain and do some additional pool maintenance.
 

Stonesphan

Member
May 10, 2021
12
Phoenix, AZ
Inorder to know what to do and how to do with the CYA you need an accurate CYA test. If you suspect CYA around 100 thats where this test tops out and you won't know if your over the 100 and by how much. You need to do a diluted CYA test and then multiply the results by 2.
I did do the diluted CyA test
 
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