Review on Natures Miracle Odor Control Universal Charcoal Filter: Pack of 6 for Effortless Freshness by Kimberly Allen

They're worth their weight in gold if you have multiple cats or large cats. My mom has 2 very large cats that use a great little box and even with daily scoops you can tell exactly when it's time to change them. Since cats have a stronger sense of smell, I hate putting scented items in the litter box and prefer these scent traps. Luckily, they probably only cost half of what you can get at your local pet store. Highly recommended, your nose will thank you.