As far as I know, there's no ...

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As far as I know, there's no such thing as "natural" activated carbon. AC is manufactured. It does not "bulk up" and prevent water flow, but can be clogged by sediments. If AC is going to be used for organics removal, suspended solids and turbidity should be as low as possible. This means filtration for suspended solids removal before using the AC to remove organics.