Review on DELTA Nature's Air Sponge Odor Absorber: Half Pound Unscented Plastic Tub - Effective and Efficient by Michelle Smith

Recommended by a friend. I bought 4 packs and gave my son 2 tubes. There is a dead rat stuck in the walls of his house that cannot be removed in any way. He placed the tub in the air conditioning vent - wow the awful smell was gone. I don't have a dead rat, but I do have a tub in the air intake so the house always smells nice! Even though I clean the litter box often, I always smelled it, so I put the pan next to the litter box and the smell was gone (out of the reach of the cats, of course). Highly recommended!