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/

When I was a kid, we'd go camping, and we had these water filters that you would pump water through, and they would filter it.

It was ceramic, and I think it was the same idea, but we used a pump to force the water through (like a bicycle pump).

Got hackernewsd

Further reading: https://grokipedia.com/page/Ceramic_water_filter