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发表于 2021-3-29 13:28
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That is Efflorescence. Harmless, just looks bad.
It's not a spill, just minerals from the concrete crystallizing on the surface of the concrete. This is very normal and when it is humid, not much can be done about it. Just wash it off when you notice it.
https://diy.stackexchange.com/questions/63876/what-is-this-crystal-on-my-concrete/63877 |
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