Review on Premium Activated Carbon for Aquariums - MarineLand Diamond Media, 40-Ounce (PA0373) by Jen Johnson

We ran out about 3 years after putting it in the litter box. We didn't buy it right away. We soon noticed. smells. No matter how many times we cleaned them, the trays just stink around them. I decided to buy another pot of this. Sprinkle a little on the trays and all odors will be gone within a day. You can literally put your face close to the hole and feel nothing. That's great. You don't need much, it should be like 5% charcoal 95% junk. Cats don't notice and don't mind if you keep the relationship light. Once, my husband who has something. overzealous personality type, cast as 50% charcoal, 50% junk. THEN the cats stopped using the litter box and started going outside. After we corrected the ratio, they returned to normal. However. You need it if you have cats.