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Mar 12 2009 How to backwash a sand filter The correct backwash rate for a highrate sand filter is the same as it was when the pool filter was in the filter cycle 1525 gpm per square foot of the filter area In rapidrate sand filters the backwash rate must be between 1215 gpm per square foot of filter area which is 45 times greater than theGet A Quote
Great energy conservation, wide adjustment range, low noise and little dust
1.5 times or even 2 times larger crushing cavity than that of other crushers, large feeding mouth
With features of reliable structure, high working efficiency and easy adjustment
VSI sand maker, also called VSI crusher, is the major machine for sand making plant.
Ball mill is the key machine to grind the crushed materials. Ball mill machine is widely used to process cement, silicate product, building material, refractory material, fertilizer, ceramics and glass, etc.
On the basis of domestic mills, fote raymond mill is produced. The raymond roller mill enjoys the features of high working efficiency, low energy consumption, small floor space and small cost.
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