4 ms·
Nice. It's like a mini version of a slow sand filter.[1] [1] https://en.wikipedia.org/wiki/Slow_sand_filter https://en.wikipedia.org/wiki/Slow_sand_filter
by Animats 2mo ago
Nice. It's like a mini version of a slow sand filter.[1]
[1] https://en.wikipedia.org/wiki/Slow_sand_filter https://en.wikipedia.org/wiki/Slow_sand_filter