Borax

[Rangeball]

I thought that the Bleach Calculator only calculated how much Borax to use to raise the borate concentration to a certain amount, mostly to use to prevent algae. The last time I looked, the calculator did not figure out how much to add to change the pH by a certain amount nor the other way around.

Richard

Having just looked at it for this specific reason a few days ago, I believe this to be correct.

Richard, is your chart at all dependent on # of gallons the 1lb is added to?

[chem geek]

Having just looked at it for this specific reason a few days ago, I believe this to be correct.

Richard, is your chart at all dependent on # of gallons the 1lb is added to?

Holy mackerel! Yes, I ran this on my spreadsheet at 16,000 gallons so you definitely need to adjust for that! Good catch!

So if your pool is larger, then increase the amount of Borax you need to add by that relative amount compared to 16,000 and likewise reduce the amount of Borax if it is smaller. Sorry about that! I'll update my post to reflect this.

Specifically, the 5400 gallon pool roytyson is using would use about 1/3rd the amount based on the table.

Richard

[Rangeball]

My 21,200 gallon pool is basically 33% more water than the 16,000 gallon you based the chart on, so I need 1.33 pounds to do the same job as 1# in your chart above.

So a 4# box of borax should give me about a 1.5-2.1 bump in ph, right?

[chem geek]

My 21,200 gallon pool is basically 33% more water than the 16,000 gallon you based the chart on, so I need 1.33 pounds to do the same job as 1# in your chart above.

So a 4# box of borax should give me about a 1.5-2.1 bump in ph, right?

Not quite. 4/1.33 = 3 so the pH jump for 4 pounds of Borax in a 21,200 gallon pool would be 3 times that shown in the table or roughly 0.15 to 0.63 depending on TA and starting pH.