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Are you using clay brick or concrete pavers? If brick, I have had a problem in the past using polymeric sand with brick. It tends to penetrate the pours of the brick and stains it. The case where I had the problem I used a cheaper product so that may have been part of the problem. We had to power wash the brick and decided not to try using it again - we went with traditional sand.
Wondering if anyone else had any trouble using polymeric sand with clay brick.
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