Rapid 'dry' sand filter
Rapid 'dry' sand filter
![Rapid 'dry' sand filter. Rapid 'dry' sand filter.](https://www.diwaterstofmonoxide.nl/foto/h2o/th_droog_grind_filter_01.jpg)
The filter nozzles let the water through but not the sand. If the filter is full of "dirt" the filter is stopped. With water and air the filter is back-washed and the dirt is deposited in a settling pond.
Video presentation of a rapid 'dry' sand filter
Update: 2022-03-20 12:34:04