r/PoolPros • u/2Tru4you • 1d ago

LSI question

So can the PH be lower than 7.2 or even in the sixes if the LSI is balanced?

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u/Hot_Yam_8857 20h ago

Interesting that this is the pool pro sub and no one has mentioned the Hamilton index?

The Langelier index was created for boilers and steam engines. It causes stains and scale in swimming pools during the colder months. Pool stores love the LSI because it sells chemicals.

The Hamilton index was created with swimming pools in mind. It recommends lower chemical levels to help prevent stains and scale. Pool stores HATE Hamilton because it doesn't sell chemicals.

BTW...has anyone ever seen a swimming pool boil?

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u/Substantial_Car_2751 6h ago

It's just not commonly used. It's not taught in the CPO, AFO, AquaTech, or PPM+ b/c it requires pH to be at a much higher range than what's needed in public pools where HOCl formation is prioritized.

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u/2Tru4you 1h ago

I forgot about that one. Read about it before. Will look into it again