Calcium hardness

dag63April 14, 2012

We have a 10 year old salt water pool. We've had lots of leaves and seeds pods get into the pool this spring, from the above normal temps I assume. Anyway, I had the water tested at Leslie's. It needed most of the usual stuff - salt and conditioner. The Leslie's tester also said that it was low on calcium hardness and needed Hardness Plus. Never before in the 10 years did we have to add that. Does this seem legit? Just wanted to check before I dump a whole lot of the stuff in my pool. Thanks.

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Need it if you have a gunite pool and some fiberglass shells.

Not needed if you have a liner pool.

The calcium in the water acts as a bias. It helps to prevent calcium from being drawn out of the plaster's cement if the pH is correct. Google Calcium Saturation Index.


    Bookmark   April 14, 2012 at 5:52PM
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Thanks, poolguynj. I have a gunite pool. It just seems odd that we never had a calcium hardness problem before in 10 years.

    Bookmark   April 14, 2012 at 6:03PM
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Plug the values of your test into the pool calculator to get the CSI value at the bottom. Target a value of 0.3 to -0.3 to keep from scaling or etching.


Here is a link that might be useful: The Pool Calculator

    Bookmark   April 15, 2012 at 4:21AM
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I'm not with ya Scott on the Liner pool needing calcium. I have seen what it will do too the liner and the white goods and internals of a filter. If its not present it's going to take the calcium from somewhere and plastic goods are are going to supply it..

J.M.O. I'm not trying to open a debate

    Bookmark   April 16, 2012 at 6:41AM
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PVC has no calcium. Some gel coats and all cement pool do. Vinyl liners don't have it either.

I agree that water is, by and large, the Universal Solvent. It is a pools toughest opponent. Next is the Sun.


    Bookmark   April 16, 2012 at 9:41AM
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I told ya no debate lol....But to me its cheap insurance based on you really only add it once a season and its cheaper than a set of ladder treads. Calcium is used as a binder or a filler as a cost reduction in a lot of plastics.

No more posts on this subject from me....

Your friend


    Bookmark   April 16, 2012 at 9:54PM
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    Bookmark   April 16, 2012 at 9:57PM
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