It is called natural pool, takes design and knowhow.

来源: 柠檬椰子汁 于 2020-01-16 12:10:57 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 次 (201 bytes)
回答: 我知道有人这么做的。 由 keeplooking 于 2020-01-16 11:56:53

Essentially you have to add pumps and pipes to direct water through natural filters such as water plants and rock/sand layer.  It is more fussy than keeping a swimming pool.  

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