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Amazon.com : Penn-Plax Cascade 500 Aquarium Canister Filter – Provides Physical, Biological, and Chemical Filtration – 115 Gallons per Hour (GPH) : Aquarium Filters : Pet Supplies
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Amazon.com : Penn-Plax Cascade 700 Aquarium Canister Filter – Provides Physical, Biological, and Chemical Filtration – 185 Gallons per Hour (GPH) : Aquarium Filters : Pet Supplies
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