Regarding the use of valveless filters
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The use of valveless filters mainly explains how to filter water and how to perform backwashing, but it does not address what to do with the dirt accumulated in the filter after such a long period of operation, that is, the issue of completely removing it from the valveless filter. Please discuss this issue.
Backwashing can wash out the dirt inside. If it’s very dirty, the sand filter needs to be replaced.