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filtration
PM sent.
From what I understand good microbes start to grow in the sand and take about 3 weeks to fully multiply, then they eat the bad microbes in the dirty water and the 4 sediment filter system traps the other particulates.
A system like this is used in modern water purification in the US, but to a larger scale, and chlorine and fluorine is added to the end product before going out into the main lines..
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