Usage Directions / Dosage: To Use With Clay Litter: Simply pour enough Arm & Hammer Cat Litter Deodorizer to completely cover the bottom of the litter pan before adding litter. Then add cat litter as usual. To Use With Scoopable Litter: Pour on top of cat litter and mix in. For added protection between litter changes, sprinkle on top of any litter (scoopable or clay) to prevent odor even longer.