Best way to clean calcium from glass tiles on waterfall?

[ChadJ]

Does anyone have a recommendation on how to get calcium buildup off of glass tiles that run along a spa with waterfall flow over into the pool? The tiles are smooth and glossy, so I am concerned about using a pumice stone or anything too abrasive. I don’t want to end up with a bunch of fine scratches or swirl marks. Any recommendations are most appreciated.

-Chad

 

[mknauss]

Diluted muriatic acid. I use 4 parts water to one part acid. Stiff brush. Use eye protection.

 

[Esloser]

Diluted muriatic acid. I use 4 parts water to one part acid. Stiff brush. Use eye protection.

Yep! Muriatic acid does the trick! I use it on the tile, but am not sure about rocks or stone?

 

[blakeusa]

And after your muratic acid treatment and it may take several attempts to remove it all you will need to balance out your PH with some baking soda or soda ash.