Rapid filters, rapid sand, dual media and multimedia beds require periodic cleaning to remove accumulated solids. Backwashing is a potentially destructive process if not properly managed. If the process is initiated too quickly, at too high a flow rate or terminated too quickly, severe damage to the bed can ocurr. Inadequate backwashing can create nearly as many problems. Leaving too many solids in the bed can lead to short filter runs at best, and worse, to more severe problems like mud balls and even cementing entire areas of the bed.
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