Filling up pool for the 1st time

ellislo

Well-known member
When I test my pool pH, the reading observed immediately is always a level lower than the reading observed after say 5-10mins.
Example, I got a reading of pH7.2 right after pH indicator mixed with the water sample. I kept the sample, with the lid still on, for say 5min later, the reading became pH7.4. So do I take the pH reading as 7.2 or 7.4?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
13,216
Northern NJ
When I test my pool pH, the reading observed immediately is always a level lower than the reading observed after say 5-10mins.
Example, I got a reading of pH7.2 right after pH indicator mixed with the water sample. I kept the sample, with the lid still on, for say 5min later, the reading became pH7.4. So do I take the pH reading as 7.2 or 7.4?
7.2

The reading after the test sits for a few minutes is not correct.
 
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ellislo

Well-known member
I have read the CSI article. With SWG, I need to maintain my CSI at 0.00 to -0.30 to prevent scale build up at cell plates. By playing around with poolmath, I need to have:

pH 7.8~8.0
CA 300

to achieve the desire CSI range above.

my question is, will pH8.0 pose any problem? Is it absolute critical to have CSI at the above range, even though I have maintained my pool chemical level based on TFP recommendation?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
my question is, will pH8.0 pose any problem? Is it absolute critical to have CSI at the above range, even though I have maintained my pool chemical level based on TFP recommendation?
A pH of 8.0 is fine if the other parameters that effect CSI (TA, CH, and water temp) are in good ranges or perhaps slightly low. Then it all compensates. That's why the PoolMath too and APP are so valuable because by entering all those numbers, it does the work for us. But remember, for the regular residential pool owner, there's no need to get overwhelmed with CSI as long as you keep all your levels within the TFP ranges. Hope that helps.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
my water temperature is between 84-86 deg F throughout the year.
In that case, you would want to keep a close eye on the pH and overal numbers in the PoolMath tool or APP. As water temp increases, especially over 80 degrees, it influences the CSI and usage of chlorine. So a pool's ability to develop scale if the pH gets too high, or grow algae if the FC drops too low, become more of a threat. With each season you begin to see this pattern in your pool and know how to adjust. Just stay close to the PoolMath tool/APP and always reference the FC/CYA Chart. Have a great day.
 
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