percolating filter meaning in English

渗床
渗滤池
渗滤器
渗透过滤器
渗透滤层
渗透滤器

Percolating filter method
渗透滤池法
Aggregates - single - sized aggregates for use as a medium in biological percolating filters
集料.生物渗透滤器介质用单一粒度集料
Wastewater treatment plants - mineral filter media and plastic media for percolating filters - requirements , testing , delivery , placing
废水处理厂.渗滤器用矿物和塑料过滤介质.要求检验