Clairification on TA

surferbum

LifeTime Supporter
May 18, 2013
69
North Scottsdale
The Recommended Levels for TA says TA 70-90+ for plaster with Bleach. The card included with my TF-100 kit say 100-120 for manually chlorinated pools. My TA measures 110-120 ppm. Don't know why there is a difference in the recommended targets.

Do I have any reason to do anything?
 

mikech

LifeTime Supporter
Aug 13, 2014
92
Seminole, FL
Depends on how stable your pH is. If it's drifting high quickly, then drop the TA and see how it goes. If it's pretty stable (mine goes up .1 every day or two - that's stable for me), then leave the TA alone, assuming your CSI is within the acceptable range.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
The TF100 recommendations are assuming you are using trichlor tablets for chlorine, which are very acidic. TFP's recommendations are assuming you are using bleach/liquid chlorine/SWG for chlorine, all of which are PH neutral. The higher TA levels for dichlor help buffer the PH so it doesn't change so rapidly from the acidic nature of trichlor.
 

surferbum

LifeTime Supporter
May 18, 2013
69
North Scottsdale
Depends on how stable your pH is. If it's drifting high quickly, then drop the TA and see how it goes. If it's pretty stable (mine goes up .1 every day or two - that's stable for me), then leave the TA alone, assuming your CSI is within the acceptable range.

Sorry but I don't know what CSI is and could only find a couple of reference to something called Calcite Saturation Index.

It looks like having a stable pH of 7.7 and a TA of 110 is okay. Am I understanding correctly?

Here's my stats from latest sample:
  • FCL 3.7
  • TCL 3.7
  • TA 110-120
  • PH 7.7
  • CH 250
  • CYA 40
 

Smykowski

TFP Expert
LifeTime Supporter
CSI looks at all of your parameters and it's final value will tell you how likely you are to have scaling (high CSI) or damage from calcium leaching out of the pool walls (low CSI).

Our general recommendation is to keep each individual value close to the TFP recommended ranges, and you won't have to worry about it - it will be balanced.

The qualifier is if one or more is seriously high or low, then you would have to compensate elsewhere to keep CSI in tje appropriate range. The value is found at the bottom of PoolMath. Given the numbers above and assuming a water temp of 85°, your CSI is .25, which is fine.
 

surferbum

LifeTime Supporter
May 18, 2013
69
North Scottsdale
CSI looks at all of your parameters and it's final value will tell you how likely you are to have scaling (high CSI) or damage from calcium leaching out of the pool walls (low CSI).

Our general recommendation is to keep each individual value close to the TFP recommended ranges, and you won't have to worry about it - it will be balanced.

The qualifier is if one or more is seriously high or low, then you would have to compensate elsewhere to keep CSI in tje appropriate range. The value is found at the bottom of PoolMath. Given the numbers above and assuming a water temp of 85°, your CSI is .25, which is fine.

Thanks. Didn't see the CSI factor and was paying attention to the items I listed.
 
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