On Kabi Kabi Land.
“However, I continue to try and I continue, indefatigably, to reach out. There’s no way I can single-handedly save the world or, perhaps, even make a perceptible difference - but how ashamed I would be to let a day pass without making one more effort.” - Isaac Asimov
@Postmortal_Pop https://www.aqsolutions.org/charcoal-biochar-water-treatment/
Scroll down for the 300L treatment. This can be modified to be smaller in diameter, not depth (sand should be about 400mm deep). Pre-filter, slow sand filter, biochar filter, drinking water in that order.