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This salts build up is relatively normal for stone,concrete and pottery outdoors, particularly on anything that involves water. Where you live might make a difference, because what the salts are comprised of will differ - in the UK, they'll largely be limescale staining/build up. You can try mixing 2 cups of vinegar with 2 tablespoons of washing up liquid (...


3

I water my plants with fountain water. Then I use chlorinated water to refill the fountain. The chlorine kills algae and mosquito larvae. The running fountain removes the chlorine. Repeat a day or two later.


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