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CLEANING THE FILTERS
Each filter bed is cleaned every two to eight weeks. With all but a foot of water drained, a tractor pulls a spring tooth harrow through the top 12" of sand. Like a large rake, the harrow loosens trapped particles, which are then washed into a nearby drain. Cleaning is completed the following day using a dry harrowing process. Each bed must be reconditioned about every 12 years. All the sand is shoveled out - by hand - and cleaned with specially designed hydraulic equipment.
Go to rapid sand filtration
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