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YouAreGenuinelyDumb t1_jdiivjq wrote

I think these are supposed to be used at the point of waste generation rather than a waste processing facility.

Plus, if you know the binding capacity of the filter and the concentration of dye, you could simply use multiple filters and swap them after a set volume. Once the used filter is removed, you can probably leave them in the sun until it’s ready to be disposed. A low cost makes this pretty viable.