Repurpose Charcoal from Spent Water Filter Cartridges
This page offers some good suggestions of repurposing the charcoal from your water filter cartridges. One way to use it is to add to your cat's litterbox.
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Water filters contain activated charcoal and after mine expire I cut open the cartridge (CAREFULLY with a steak knife) and pour the contents into my cats' litter box to reduce odor. I could also use it in my chicken coop for the same reason.
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