Portable Screening Plants For Processing Topsoil, Rock - Eagle Iron Works Wash Plant for US Sand and Gravel ...
it is common to backwash at a low rate to allow the surface wash to scrub the top of the filter. The backwash rate is then increased to 15-17 gpm/ft2 for 10-15 minutes to wash the filtered particles from the filter. In deep bed filters and those in difficult filtration situations,
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