需上漆的表面要无油脂、尘污和松散物质，新建的墙壁需充分干透。
The coating surface must not have the fat, the dust dirty and the loose material, the newly built wall needs fully bone dry.
无密实核心。具有滤速高、水头损失小、含污量大的优点。
The utility model has the advantages of high speed of filtering, small loss of water head, and generous content of dirt.
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