The drilling mud is evacuated from the borehole after casing the well by pouring or injecting water into the casing, called backwashing.
22.
The bi product of backwashing is sludge which is either tankered away or is run to waste if the composition is within the tolerable limits.
23.
Sand filters can be cleaned by backwashing; the flow of water is reversed so the accumulated sediment is pushed from the filter and flushed out as waste.
24.
The tanks _ known as multilayer depth filters because they use five layers of filtration material to scrub incoming water _ automatically clean themselves by backwashing at regular intervals to flush out accumulated sediment.
25.
Resin is then regenerated by sequentially backwashing the resin bed to remove accumulated solids, flushing removed ions from the resin with a concentrated solution of replacement ions, and rinsing the flushing solution from the resin.
26.
Other filters utilizing higher-density media such as sand, foam and peat moss do not produce a sludge that must be removed, but require forced air blowers and backwashing or an enclosed anaerobic environment.
27.
Now, pools compete with other status symbols, like cavernous great rooms, heated towel racks, vacation homes at the beach, and Martha Stewart-caliber gardens, none of which require chlorination or backwashing.
28.
To clean the filter, water is passed quickly upward through the filter, opposite the normal direction ( called " backflushing " or " backwashing " ) to remove embedded or unwanted particles.
29.
Prior to this step, compressed air may be blown up through the bottom of the filter to break up the compacted filter media to aid the backwashing process; this is known as " air scouring ".
30.
The backwashing time is determined by either the turbidity value behind the filter, which must not exceed a set threshold, or by the head loss across the filter medium, which must also not exceed a certain value.
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