How does water get filtered while passing through sand, charcoal, etc.?
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In waste water facilities, they have long settlement ponds/troughs. Anything suspended in the water will settle out as the water slowly moves across the pond/trough. Anything still suspended (fines) will then be filtered out with several gradients of sand, coming out the other end as mostly particulate-free water. The water then gets passed through purification systems with activated charcoal for capturing harmful chemicals, and adding chemicals to kill the various bacterias that are harmful but can’t be removed using charcoal.
At the end of the process, the cleaned water can be either discharged into the local water ways, or sent back through the pumping stations for reuse.
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