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This is called efflorescence and is the result of water moving through the concrete and depositing dissolved calcium salts. The best and most expensive way to solve it is to dig alongside and expose your basement walls so they can be waterproofed with membranes, french drains and perhaps insulated. However there are products you can apply on the inside which form a waterproof membrane on the inside, such as UGL's Drylok. It definitely improves your basement and prevents moldy, musty smells etc. Follow the directions for the product you choose.

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