Penn Plax Cascade 500 GPH Bio Sponge by Penn-Plax
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<b>[Product Information]</b><br>
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<li>Pack of 4 Cascade 500 GPH Bio Sponges</li>
<li>Convenient, no-fuss replacement sponge for your Cascade canister filter.</li>
<li>Optimizes the colonization of beneficial aerobic bacteria.</li>
<li>Removes ammonia & nitrites keeping your aquarium healthy.</li>
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