Humus can be harvested either by hand-sorting or waiting until the earthworms have migrated. It then can be used to enrich soil or potting substrates. This system works by the earthworms building their colony in the upper section (approximately in the first 15 centimetres) with the humus that has been produced remaining in the lower section and the leachate draining into the biofilter which then becomes enriched with nutrients as it passes through the humus. This type of worm composter is mostly used for collecting leachate.
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