Reducing TA - How long?

red-beard

Gold Supporter
May 27, 2019
1,395
Houston, TX
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite Pro (T-15)
FC 8, pH 8.0, TA 90, CYA 80, Borates 50, Salt 2900 as of 7 AM this morning. Poolmath says to add 1.5 gallons to reduce the pH to 7.0. Added!

I'm now "aerating". The question is, how long should this be? Lower Total Alkalinity - Trouble Free Pool just says to keep doing it until the pH reaches 7.6.

Also, is this enough Aerating?

 

red-beard

Gold Supporter
May 27, 2019
1,395
Houston, TX
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite Pro (T-15)
Would I be better off connecting a hose with a sprayer to the submersible pump? I've never tried to lower TA before. Target is down 20 points, which is what Poolmath says 1.5 gallons of MA will do.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,876
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
More aeration the quicker it goes.

I don't see an issue with your water chemistry. Why are you pushing your TA lower? Your CSI is running pretty negative already.
 

red-beard

Gold Supporter
May 27, 2019
1,395
Houston, TX
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite Pro (T-15)
pH Stability. Just want to drop TA to about ~70. With pH 8.0, TA = 90, borates at 50 and CYA 80, my Carbonate Alkalinity should be ~57. I'd like to get it in the 30-40 region.
 

Enjoying this content?

Support TFP with a donation.

Give Support

Stoopalini

Gold Supporter
Jun 8, 2020
534
Central Texas
Pool Size
14060
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Update. The pH has stabilized at 7.8. Very very happy with the results.

Being a month later, how has this been working out for you?

I'm a couple of hours north of you, in Central Texas, and am debating adding Borates to my pool to try and reduce the pH reading where the water settles. I already have my TA around 60 - 70, but my pH still rises fairly quickly (about 0.10 points every 12 hours), and settles around 8.1 at equilibrium.

I started a thread to discuss ways of controlling this, when Marty remembered your post and referred me to it :)

I'm wondering if I add 50ppm Borates to my pool, and keep my TA around 60 - 70 ... if that'll be enough to lower the carbonate alkalinity of my water to result in equilibrium occurring in the 7.8 or so range, instead of 8.1. This seems to be exactly what you did, and I'm hoping it's been stable for you.
 

red-beard

Gold Supporter
May 27, 2019
1,395
Houston, TX
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite Pro (T-15)
Adding the borates will increase your TA. You then reduce your TA which will reduce your CA.

pH is more stable. I need no more than 1 qt of MA a week now, when I used to add that every 2-3 days. So I went from a gallon every 10 days to a gallon a month. My TA is 70-80. So I could try to go lower.
 

Stoopalini

Gold Supporter
Jun 8, 2020
534
Central Texas
Pool Size
14060
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Adding the borates will increase your TA. You then reduce your TA which will reduce your CA.

pH is more stable. I need no more than 1 qt of MA a week now, when I used to add that every 2-3 days. So I went from a gallon every 10 days to a gallon a month. My TA is 70-80. So I could try to go lower.

Hmm, I didn't think Boric Acid would increase the TA ... did you use Borax and Muriatic acid to add your Borates?

I'm basing my understanding on This Further Reading Article

1628184977764.png


So adding the qt. of MA per week, are you able to keep the pH at 7.8 or below?
 
Thread Status
Hello , This is an inactive thread. Any new postings here are unlikely to be seen or responded to by other members. You will get much more visibility by Starting A New Thread