Are there any methods for cleaning the sand in rapid filter beds?
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Our unit was responsible for the design and construction in 2005, and rapid filters filled with sand were used for the preliminary treatment. After several years of use, the filtration speed slows down, and the surface becomes covered with organic substances and colloids. Does Haiyou have any experience with cleaning? (Don’t remove the sand filter for cleaning.)
The inlet pipe of the original filter was temporarily connected to water; by utilizing the principle of backwashing, debris on the surface of the filter was washed away
Try using an appropriate amount of sulfuric acid solution for backwash circulation?
If the filter sand becomes compacted, manual replacement of the sand is the only option
For compaction, it is possible to soak it in hypochlorite followed by rinsing and replacement with clean water.