Yeah... i was shown it by a guy many years ago.... basically you build a dig a grey water with cement block, patterned such that they overlap providing small spaces at the V-connect. You can even just poke some on inch holes in some of the blocks. And behind the block you leave about 3 inches.... you smash the collected glass and fill behind the circular wall with the broken glass. The glass prevents it getting stuck after years of gunk...it dust allows the water to keep filtering slowly. Pretty Guatemalan thing really...not sure if its up to code😂. But i like it as its another excuse to recycle. Takes about 6-9 months of collecting bottles to be ready for back filling....
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