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...

There is a company[1] in Indonesia that actually makes very nice versions of this tech.

[1] https://www.terrawaterindonesia.com/

Got hackernewsd