Does activated carbon work for cat litter?
Last updated: February 2025 • Evidence review
Yes. Here is the proof.
Activated carbon eliminates cat litter odor through adsorption—a physical process where ammonia molecules bind to carbon's porous surface. One gram has 1,000+ square meters of surface area. The same technology is used in water treatment plants, gas masks, and hospital air filtration systems.
The Evidence Breakdown
Industrial Use
Municipal water treatment uses activated carbon to remove contaminants. If it works for drinking water, it works for cat litter.
Surface Area Science
One gram = 1,000+ m² surface area (size of 10 tennis courts). Ammonia molecules collide with and stick to this massive surface.
Physical vs Chemical
Carbon physically traps ammonia (adsorption), not a chemical reaction. This means it works until full, then you replace it.
Activated Carbon vs. Alternatives
| Method | How It Works | Effectiveness |
|---|---|---|
| Activated Carbon | Traps ammonia molecules | High ✓ |
| Baking Soda | Neutralizes acid (not ammonia) | Low |
| Fragrance Sprays | Masks odor temporarily | None |
Common concern: "I tried it and it didn't work"
Usually means: (1) Not enough carbon used, (2) Carbon was already saturated, or (3) Expecting it to work without daily scooping. Carbon eliminates airborne ammonia—it does not remove physical waste.
Want the deep science? Read: How Does Activated Carbon Work? Complete Science Guide