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YouAreGenuinelyDumb t1_jdhtmy7 wrote

It looks like the cellulose is supposed to grab the dyes out of the water, and the exposure to sunlight is supposed to break them down. Whether they exfiltrate after breaking down, nor whether those degradation products are safe, isn’t clear.

If it does exfiltrate and it is safe, it seems pretty low waste, though. Otherwise, you would probably have to either swap the filters or recharge with fresh cellulose (and incinerate the old cellulose).