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
18,090
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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ellislo

Well-known member
My pool is fully on SWG now. I have a question:

Chlorine dosing with SWG using the following under a bright sunlight (high UV):
1. Pool return nozzle
3E9BA1F2-61DE-4FED-BA90-C3B6F48177D8.jpeg
2. Sprayer
C5DD6A7D-A293-4633-8C90-8C82283FF4F2.jpeg

I suppose option 1 will be more effective as the FC exposure to UV are very much less, whereas option 2 is less effective as the FC in the droplets when being sprayed out from the sprayer have higher exposure to UV. ?
 

kimkats

Mod Squad
LifeTime Supporter
Jul 10, 2012
45,511
Tallahassee, FL
The sprayer will also cause your pH to rise so that is another vote against it. BUT when the water gets too warm the sprayer run at night will cool your water down some and it fun to play in!!
 

ellislo

Well-known member
I actually want my pH to rise. Currently pH at 7.4, I am targeting pH 8. I can’t use Soda Ash to raise it as my TA already at 70. So I have to use the sprayer to raise it.

Maybe I should run my SWG in the evening with the sprayer, to reduce FC lost to UV.

In summer time over your place, how warm can the water get? Over here, my water temperature is always between 84-86 degree F, which is just nice for me ?
 

ellislo

Well-known member
Currently, I am only feeding my pool with chlorine from SWG. I read that the pH will drift up with splashing of the water during swim, but my pH seems like driftzing down, is this possible? And does running the SWG depletes the salt contain in the pool?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,645
Laughlin, NV
If you are adding significant fill water or rain water, that can effect pH.
Salt is not depleted by the SWCG. It only leaves the pool by you removing the water from the pool.