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Granulated activated charcoal is activated charcoal in small pieces: "granulated" is the size, "activated" is the processing that fills the carbon with pores, so a charcoal can be granulated without being activated.
Purrify is granules of activated carbon made from 100% steam treated coconut shells, made to mix into cat litter.
To put activated carbon granules to work in the litter box, see the Purrify bags.
| Word | What it describes | What it means for odor |
|---|---|---|
| Charcoal (plain) | Carbon that has not been activated. | Wikipedia puts its surface at about 2 to 5 square metres per gram before activation, far less than activated carbon. |
| Activated charcoal | Carbon processed (activated) to have small pores that greatly increase its surface area. | Odor molecules stick to that surface. Wikipedia gives over 3,000 square metres per gram for activated carbon. |
| Granulated activated charcoal | Activated carbon in larger pieces than powdered activated carbon. | Same pores, bigger pieces. The EPA calls granular activated carbon a porous adsorption media with extremely high internal surface area. |
Activation is the step that opens up the pores. Wikipedia says it can be physical, using oxidizing gases such as steam or oxygen at high temperature, or chemical. The EPA says manufacturing processes create or enlarge the pores, and lists coconut shells among the raw materials. Our guide to how activated carbon works shows what the pores do with odor.
Purrify is granules, the same sort of shape as cat litter, so it mixes through the litter instead of sitting in a pouch beside the box. If you have seen a charcoal bag hung near the box, our look at charcoal deodorizer bags explains how far one reaches.
Because it goes through an activation step. Wikipedia says the carbon is processed (activated) to have small pores that greatly increase its surface area. The EPA says physical or chemical manufacturing processes create or enlarge those pores.
Purrify is 100% steam treated coconut shells you mix into the litter you already use. It traps odors more effectively than anything else on earth.
Sprinkle 2 tablespoons of Purrify granules per litter box on fresh litter and mix gently. Top up whenever the box starts to smell again.
