Kwa lugha ya kitaalam tuayaita septic tank,. Huu mfumo hujumuisha septic tank na soakaway pit, hii septic tank ina sehemu ya kutolea maji ambapo yanakwenda moja kwa moja hadi kwenye soakway pit, kazi ya soakway pit ni kuyafyonza,kuyanyonya ua kuyanywa haya maji.. kinachofanyika kweye soakway pit...
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