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My swimming pool is developing a calcium buildup on the coping tile at the waterline, what is the best method to remove it? Pool chemistry is balanced regularly and has not been a problem.

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CLR or other mild acidic cleaner will dissolve the calcium, even clear vinegar.

The calcium is in your water supply and is depositing out due to evaporation. A water hardness test kit will tell you the real story. Your pool chemical dealer will have a treatment option for chealating the calcium out.

Here's an article from Taylor chemical

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Is CLR safe for a swimming pool? My container says to wear rubber gloves and not mix with other cleaners, among other warnings, so it may not react well with people swimming in the water or the chemicals used in pool water. – BMitch Mar 15 '13 at 15:15
The real answer is in the second part of my answer, which is to adjust the water to stop deposition in the first place. The pool water is an incredible dilution factor. It may be necessary to drain water to even be able to put enough acid on the scale to remove it. – HerrBag Mar 15 '13 at 17:53

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