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Balancing a pools pH with Boron in the water


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Hi All,

One of the pH adjustment programs I use takes the amount of Boron in the water into account. I'm not sure it matters - So I'd like to know if the Boron concentration in pool water affects the amount of Hydrochloric Acid required.

If so, how? Is there a formula I can use to adjust for the amount of Boron?

Thanks in advance,

Buddy.

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42 minutes ago, NotYou said:

Hi All,

One of the pH adjustment programs I use takes the amount of Boron in the water into account. I'm not sure it matters - So I'd like to know if the Boron concentration in pool water affects the amount of Hydrochloric Acid required.

If so, how? Is there a formula I can use to adjust for the amount of Boron?

Thanks in advance,

Buddy.

I don't know about a formula, but this link: https://www.borax.com/BoraxCorp/media/Borax-Main/Resources/Brochures/borates-swimming-pools.pdf seems to contain a lot of information about the use of borates in swimming pools. It seems to act as a buffer, enabling the chlorine to work in its best regime and also to soften the water by binding calcium.

If it acts as a buffer, it may be that by using borates you can fully control the pH with them alone and can dispense with the hydrochloric acid entirely, but I stress I am learning all this as I go in response to your queries, so you might want to do some further checking.

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Thanks for the link exchemist

However I know what Boron is used for. I just don't know if the Boron levels affects the amount of Hydrochloric Acid I require.

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2 hours ago, NotYou said:

Thanks for the link exchemist

However I know what Boron is used for. I just don't know if the Boron levels affects the amount of Hydrochloric Acid I require.

OK, then I can't answer that for sure. But seeing as borate is sold as a buffering agent, it looks to me as if using it may make use of HCl unnecessary. But you would need to check with a supplier of borate, I guess. 

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4 hours ago, NotYou said:

Thanks for the link exchemist

However I know what Boron is used for. I just don't know if the Boron levels affects the amount of Hydrochloric Acid I require.

Yes it will.

 

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1 hour ago, NotYou said:

Can anyone provide the calculations to compensate for the Boron?

I certainly can't - and I doubt anyone else can since it seems, from the link I gave you earlier in the thread, to depend on what borate product you are using. The DOT product in the link is said to give a more or less ideal pH on its own. At least, that is how I interpret this passage:

"When used in pools at typical dilution, the new formulation has an ideal pH of ≈7.6. Above pH 8, the chlorine becomes much less effective as a sanitizer, but below pH 7.4 the equilibrium trends toward hypochlorous acid and chlorine is lost more rapidly."

 So, as I say, I think the best bet is to check with the supplier's recommendations for whatever borate product you are using - or have in mind to use. 

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  • 1 month later...
On 5/9/2021 at 6:19 AM, exchemist said:

I certainly can't - and I doubt anyone else can since it seems, from the link I gave you earlier in the thread, to depend on what borate product you are using. The DOT product in the link is said to give a more or less ideal pH on its own. At least, that is how I interpret this passage:

"When used in pools at typical dilution, the new formulation has an ideal pH of ≈7.6. Above pH 8, the chlorine becomes much less effective as a sanitizer, but below pH 7.4 the equilibrium trends toward hypochlorous acid and chlorine is lost more rapidly."

 So, as I say, I think the best bet is to check with the supplier's recommendations for whatever borate product you are using - or have in mind to use. 

Let me see if I understand. The measurement is simply, how acidic you want the pool water to be? That'll be easy, simply by calculating or experimenting, to get the precise ratio for the desired pH.

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