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.
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