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French company CID (Concept Ingenerie Diffusion) has developed a system which it claims will eradicate moisture and strengthen damp walls.The system, called 921 DMF, is an electrical process which, unlike traditional surface treatments, cannot clog pores and allows the wall to breathe.CID says that, in normal conditions, the natural electrical polarity of a wall is positive at the top and negative at the bottom. But the presence of water at the base inverts this polarity and produces ...

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