Alkalinity- how low is too low?

SoFlo Tech

In The Industry
Feb 5, 2022
14
South Florida
So I have been maintaining 75 customers’ pools for almost a year now and am always battling high ph. Especially with salt cell systems.
One thing I have observed is that when keeping a lower alkalinity (50-70) my ph remains a steady 7.2 - 7.8. In the past this alkalinity would cause me to add 6-9#’s of bi-carb thus raising my ph level to 8.0+.
I would then be adding muriatic acid to lower the ph level likewise lowering the alkalinity levels back down again. It is a constant battle.
Ive noticed several technicians I work with keep their alkalinity levels lower too.
Im curious to a veteran view on this.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
39,430
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Welcome to TFP! :wave: Yes, we generally find that the pH remains more stable in salt pools with a lower TA. The link below is our reference for recommended levels based on various factors such as salt, pool surface, etc.

 

SoFlo Tech

In The Industry
Feb 5, 2022
14
South Florida
So,,

As long as your pH is somewhat stable, it does not matter how low your TA goes.

At the same time, you want to try and keep your CSI between 0 and -.3

Thanks,

Jim R.
This is my understanding also. After reading several articles online it appeared the alkalinity is mainly just a buffer to help stabilize the ph. If the ph is remaining steady around 7.6, don’t mess with the alkalinity.
Just confirming if this is true.
 

pjt

Gold Supporter
Jan 7, 2012
701
The Woodlands, TX
Pool Size
21000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
when keeping a lower alkalinity (50-70) my ph remains a steady 7.2 - 7.8
That's perfect and desirable.

add 6-9#’s of bi-carb thus raising my ph level to 8.0+
There's the problem. :)

Don't chase TA; it's the least important parameter of water chemistry. Let the TA settle where pH is stable.
 
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