AquaMaxx Phosphate Out Granular Ferric Oxide Filter Media GFO - 4 Quart
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<b>[Product Information]</b><br>
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<li>Rinse before use</li>
<li>Use 1/2 cup per 50 gallons for saltwater aquariums</li>
<li>Test phosphate levels and replace media when levels begin to rise (approximately every 1-3 months)</li>
<li>As with all ferric oxide media, alkalinity levels may drop when used. Be sure to monitor alkalinity</li>
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