| 摘要 |
PROBLEM TO BE SOLVED: To provide air piping capable of being discriminated even if contaminated with sewage or SS and capable of simply cleaning a stain. SOLUTION: In the air pipings of a septic tank having a plurality of unit devices of which the functions are developed through the supply of air from a blower, the connection parts (joints) of the air pipings connected to the respective unit devices are colored by colors different corresponding to the respective unit devices. Further, the names (the abbreviation or purpose of a destination such as 'aeration', 'circulation', 'backwashing' or the like may be used) of the unit devices are preferably written on the connection parts.
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