which is more accurate the poolmath website or the poolmath app?

They’re both dead on......

Please make sure your settings use the same pool size on both and make sure they’re both using the same unit of measurement (gallons, liters)
 
Pool volume
14k
Current chlo one 1
Rise to 3
Cya is 35
App says add 37 oz
Website says add 34oz
Using 10.5 trade% bleach, I get 34oz, by volume, of bleach using both the app and the website

Pool volume
14k
Ph from 7.4 to 7 Ta 110
App says 46 oz
Website says add 43oz
I get 43oz, by volume, of 31.45%-20 Baume Muriatic Acid using both Pool Math Website AND the App


Looks to me like your pool volume settings are different in the app and the website.
 
Pool volume
14k
Current chlo one 1
Rise to 3
Cya is 35
App says add 37 oz
Website says add 34oz

Ph from 7.4 to 7 Ta 110
App says 46 oz
Website says add 43oz
Are you using the PoolMath on this forum?

When I do, I get the following to raise FC from 1ppm to 3ppm in a 14,000 gal pool:
8.25% bleach = 41oz
10% bleach = 36oz
12.5% bleach = 29oz

What strength bleach did you use to get 43oz?

825.jpg

10.jpg

125.jpg
 
If I enter 14000 gallons in either I get 34 oz of 10.5% bleach to raise the FC by 2 ppm.
If I enter 15000 gallons in either I get 37 oz of 10.5% bleach to raise the FC by 2 ppm.

I just did that because I saw that your sig lists your pool size as 15k and you entered 14k in Poolmath.
 

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