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the use of back washing sand in pure water factory

Sand: Density (lb/ft ): 100 Bed depth (inches): 18-30 Service flow (gpm/ft ): 3-5 Backwash flow (gpm/ft ): 15-50s Filter sand is naturally occurring sand that is high in silica and low in calcium. It is graded and washed. It can be used independently or as part of a multi-media filter

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