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![sandraAFRL Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::396795992.png) Sandra Pérez [@sandraAFRL](/creator/twitter/sandraAFRL) on x XXX followers
Created: 2025-07-24 00:25:38 UTC

Bio-sand filters built with local sand and zeolite layers provide slow-sand filtration at household level, removing protozoa and turbidity effectively. #BioSand #LowTech


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[Post Link](https://x.com/sandraAFRL/status/1948177718354313428)