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- Hacker News
- I wonder if you could achieve the same effect more easily/consistently using cement. It's basically how aquifers "filter" water. Limestone is naturally permeable unlike fired clay.. were you need to control the porosity. I'd imagine cement mixtures are much easier to handle and you can make arbitrary shapes (higher surface area and higher hydraulic pressure to increase the flow rate)by geokon
- Nice. It's like a mini version of a slow sand filter.[1]by Animats
- by rainworld
- I'm in Antigua, Guatemala where the embedded video is from. As the video says, it may be "low tech", but it's not like something you can do very easily for yourself. Ecofiltro is everywhere here. But, it is more expensive then I would have thought - maybe $30 for a clay pot and $50 for it's container.by ks2048
- There is a company[1] in Indonesia that actually makes very nice versions of this tech.by fastball
- Hmm just shared this with someone who works in this space in India, they got angry.
> It doesn’t work for 3rd world contaminants.
> White people have been making these for years. Doesn’t work
> We need hard TDS removal also
And the ceramic ones apparently are also bad:
> we had one of these for many years while growing up. the ceramic candles got fungus on them
Viruses are the bigger threat I think and just a filter like this will not stop them HepC and the like would be easily transmittable. Not really “safe”, maybe at best “better than nothing”
by seer - Ceramic filters are very common in Brazil, used in clay recipients which also keep the water cool even in summer without spending energy.
https://g1.globo.com/saude/noticia/2026/03/14/filtro-de-barr...
by cassianoleal