Keep your underwater loved ones in a clean and pristine aquarium with Top Fin's Large Filter Pad. This pad helps remove fine particles that'll keep your water looking clear and clean. It's the best way to show your aquatic friends how much you care. Only at PetSmart. Features: Removes fine particles, Helps maintain a healthy aquarium Intended For: Aquariums Includes: (1) Pad - 7.75 in L x 7.75 in W x 1.1 in H Intended for: Top Fin Large Canister Filter Cautions: This is not a toy. Keep out of reach of children. Directions: Use 1 Top Fin Large Filter Pad for the Top Fin Large Canister Filter Rinse pad thoroughly before inserting in filter. Place directly into chamber. To help maintain a healthy aquarium, rinse filter pad as needed, and replace every 4-6 weeks. Discard after use. Change out 10% of the water weekly or 25% monthly. Use a water conditioner (sold separately) every time you add fresh tap water to your aquarium. Never use soap, detergents or cleaning agents while cleaning the aquarium or equipment as they can harm your fish. Size: Large.