Wedge span>is welded by profile V-rt lso called Johnson screen. It has a large filter area because of the big opening, vee are easy for automatic backwashing and avoids pipe blocking. The pressure will be reduced when water flows in for greater filter area, avoid the grains of sand flow in the wedge he high-pressure conditions, so extend the pipe's life. Between the same length, diameter and slot size, wedge hrice than bridge filter pipes. Moreover, we have inside perforated metal and wedge ide filter.
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