Backwashing is the process of cleaning the filters. Consider that the job of the filters is to trap as much of the various types of pollution as possible and you will appreciate that over time, more and more of this pollution will build up within the filter media. At regular intervals, this accumulated pollution needs to be gotten rid of. The method is to reverse the flow of water through the filter, so instead of water going in at the top and coming out at the bottom, the water goes in at th...
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