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Washed and calibrated siliceous gravel.


Draining natural product to be inserted between the borehole walls and the screening column.The use of this material retain the slots of the filter from occlusions as it acts as a pre-filtering barrier and avoid the risk of underdimensioning of the microslotts of the screen itself.


25 kg plastic sacks. Other packaging available on request.

Technical sheet
Security sheet
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