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Penn-Plax Cascade Optimizer Pre-Filter for Aquarium Canister Filters – Universal Fit, Connection, and Function - Walmart.com
PENN-PLAX Cascade Hang-on Aquarium Filter With Quad Filtration System Up to 35 Gallon Tank, 1 each - Fry's Food Stores
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Amazon.com : Penn-Plax Cascade 1000 Aquarium Canister Filter – Provides Physical, Biological, and Chemical Filtration – 265 Gallons per Hour (GPH) : Pet Supplies
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