Bacteria bed definitions

bacteria bed

[n] - layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms
Found on http://www.webdictionary.co.uk/definition.php?query=bacteria%20bed

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bacteria bed

noun layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms
Found on https://www.encyclo.co.uk/local/20974

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