All pumps, piping, filter vessels, the rinse reservoir, and the housing must be made of 304 or 305 stainless steel or PVC or CPVC.
所有的泵，管路，过滤器，冲洗液循环槽及壳体必须用304或305不锈钢或PVC, CPVC材料制造。
2
Hexi Reservoir Project, applying filter design, is introduced, which is made up of clay central core and sandy gravel dam according to the gradation curve of clay and gravel.
The microbiological characteristics of the bio-film in a bio-ceramisite filter treating slightly polluted source water from Guanting Reservoir in Beijing at low temperature are researched.