Dr. Elsey’s respiratory relief cat litter was a game changer for my household. One of my cats has asthma, and dusty litter made it worse. This formula is noticeably lower in dust, especially when pouring. Clumping isn’t quite as hard as the Ultra, but it’s still scoopable and doesn’t stink up the room. I haven’t had to wipe down surfaces nearly as often. Combined with a wet-food-heavy diet like Pure Cravings, his breathing episodes have become less frequent.