日韩国产欧美一级_高清国产成人Av在线_国产在线精品免费电影_真实人与人性恔配视频

The filter can remove large suspended particles in the solution, thereby reducing the SDI value of the water and meeting the requirements of medium purification. The equipment has the characteristics of low cost, low operating cost and simple operation; the filter material can be used repeatedly after backwashing, and the filter material has a long service life.