A totally natural algae inhibitor that absorbs excess nutrients such as phosphate and nitrate from the water which together with sunlight, makes algae grow. It also inhibits string algae or blanket weed. Made from a special blend of volcanic rocks, carbons and silicates, it is completely free from any manufactured chemicals. Replace every 6-9 months for best results to ensure algae free water at all times. No mixing, measuring, applying and reapplying of chemicals. No messy straw, no cleaning and no water changes to make. Measures 12" x 4" x 2". Recommended for up to 150 gallons of water.
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