I have a rough surface black granite fountain in the back yard. Its been running for about 2 months and now it has white (calcium?) all over the face. How should I clean the granite? I have since purchased water additives (fountec and protec) and plan to use them going forward, but want to get the rock back to its original condition.

Thank you,
Barbara

Hello Barbara,

This should be easy to clean. First use a dry brush and scrub off the loose mineral deposits. Then, apply a weak phosphoric acid cleaner solution to the area and brush again. You can find this at the hardware store. And more solution as necessary to remove all the mineral deposits. The phosphoric acid will not harm the black stone surface but keep it away from any metal parts and away from concrete.

Best wishes,
Tom Cordova

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