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rotor pump, easily available in the market. The main drawback is the limited pumping distance that cannot exceed 75 meters.
* Spinning head wet spray: this method is similar to the first, but the manual spraying is replaced by a spinning head projecting the mortar onto the repaired surface. This method is fast and especially suited for cylindrical chambers such as manholes. When a structure is so severely corroded that human entry is a risk, spinning head application permits an "un-manned" consolidation of the manhole.
* High pressure

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