The Aerobic Pre-treatment is suitable for showers, hand-washing and laundry. This treatment is used to remove large particles and fibers. It protects the subsequent infiltration pipes from clogging and transferring the water as soon as possible for treatment into a biologically active, aerobic soil-zone environment where both macro- and microorganisms can thrive. Stretch-filters are made to retain fibers and large particles and allow the rest of the organic material to travel on to the next stage of processing. This filter is suitable for public facilities where the principal source of greywater is hand-washing and showers without any food waste to speak of. If this type of filter is used to remove food wastes, these will accumulate in the filter which then becomes anaerobic and makes the effluent malodorous. The result is often that too frequent changes of the stretch-filter becomes necessary, thus creating an undesirable,high-maintenance situation. Water obtained from this treatment can be used for planter irrigation.
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