Filter should be completely submerged in water, its depth about 30 cm.
滤网应完全淹没在水中，其深度在30厘米左右。
Submerged biological aerated filter tank is a new sewage treatment device and possesses the advantages of small occupying land, high efficiency and low energy consumption.
淹没式曝气生物滤池具有占地小、效率高和能耗低等一系列优点。
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