re: Pool people - Is it worth it to install one??

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What about Calcium? Surely you add that more than once in the spring.

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The first couple of years my kids generated a lot of splash out and towards the end of the summer I would have to add a bit of Calcium. The last few years there's been a lot less diving board usage and haven't had to add any additional calcium. I monitor the water chemistry frequently, and usually start with a hardness of around 300-320 ppm. It might dip to 280 or so by the end of the summer but still in acceptable range.