Oase 20ppi Ultra Coarse Replacement Filter Media Foam for BioMaster 250/350/600 Aquarium Filter - Blue Dr. Sniff This grain-free recipe provides the

This grain-free recipe provides the benefits of poultry and fish: chicken contributes muscle-building protein

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Formula One is red and is produced for fish with higher protein needs

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Oase 20ppi Ultra Coarse Replacement Filter Media Foam for BioMaster 250/350/600 Aquarium Filter - Blue Dr. Sniff This grain-free recipe provides theOASE BioMaster 20ppi Blue Filter Foam An ultra coarse (20 ppi) blue foam insert for OASE BioMaster canister filters. This single replacement sponge is designed to catch large particles and serve as the first stage of mechanical filtration, while maintaining strong water flow. It helps prevent clogging of finer media, is easy to rinse and reuse, and should be replaced as needed to keep your filter working efficiently.