沙井主要收集地面的污水，如大雨過後，沙井可能會積滿樹枝及落葉，亦會因大型垃圾或雜物導致堵塞。使用不同型號的高壓車或吸缸車以 “通吸” 形式雙管齊下，令沙井回復暢通。
流程*
到達現場後會先清理渠道表面大型垃圾
若有堵塞，會使用高壓車或吸缸車進行清理
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