Water can be purified by filtration through sand.
水通过沙滤可以变清。
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Between these tentacle-like projections are tiny gaps called filtration slits that act like a sieve allowing only small particles such as water, glucose and ionic salts to pass through while blocking large proteins and red blood cells.
在这些触手状的突出物之间有微小的缝隙,称为滤孔;像筛子一样只允许小分子物质如水、葡萄糖、盐等通过,而阻挡大分子蛋白质、红细胞等。

He launched Liquify, a non-profit with a mission to provide sustainable filtration systems, help residents build recharge wells that replenish aquifers, and water catchment systems to collect rainfall for other uses.
他创立了Liquify公司,这是一个非营利组织,其使命是提供可持续使用的过滤系统,帮助居民建造补充蓄水层的补给井,
及将雨水收集作其他用途的集水系统。