Jisho

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Noun
1. water-purification tank
Noun
2. septic tank
Wikipedia definition
3. Septic tankA septic tank is a key component of the septic system, a small-scale sewage treatment system common in areas with no connection to main sewage pipes provided by local governments or private corporations. (Other components, typically mandated and/or restricted by local governments, optionally include pumps, alarms, sand filters, and clarified liquid effluent disposal means such as a septic drain field, ponds, natural stone fiber filter plants or peat moss beds.
Read “Septic tank” on English Wikipedia
Read “浄化槽” on Japanese Wikipedia
Read “Septic tank” on DBpedia

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