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該產品頂蓋是採用機關原理設計，帶一個頂置螺紋口壓板，方便打開和關閉並有良好的密封效果；另外正大濾床表面到布水頭的距離，從而提高過濾階段的布水效果，並避免在反沖洗時砂濾落入布水管內。本型砂缸特別設計的人孔，使砂缸在換砂過程中更方便，更高效。在過濾過程中，可通過本型砂缸設計的透視孔觀察水質的過濾情況。

COMMERCIAL SAND FILTER

  New spiral cover system which aids the operations of opening and closing,The air purge is built into the cover which can be efficient to release the air from the filter.The distance between the upper part of the sand layer and the diffuser head(“freeboard”) has been increased to ensure grester distributiom of water in the filtration phase and avoid sand being split into he drain during backwash.Thespecially designed hole in the sand filter can make the sand exchanging process more convenient and efficient.In the filtering process.thefilering effect of water can be observed through the perspective hole which is designed in the sand filter.