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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 a 'pump' effect which draws the moisture up the wall.The 921 DMF system sends impulses from a 220 V transformer to copper electrodes inserted in the wall. Electrical pulses drive the water molecules to the surface where they evaporate. The copper ions released from the electrodes stabilise salts carried by the moisture, claims CID.When the wall is completely dry, the device automatically switches off, reactivating only when moisture is detected.The company is now seeking UK distributors for the system.CID, Tel: (01033) 16 93 38 94 96. CONSTRUCTION NEWS