QUOTE(zhou.xingxing @ Nov 7 2019, 10:46 AM)
Wanna clear methane gas just leave it open for some time. And usually septic tanks will have a ventilation pipe for it.I always ask my kuli to be extremely cautious when opening septic tanks. Throw fire inside I 1st time heard about this.
Nov 7 2019, 10:55 AM

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