Maintain a large biological load within a small filter area. Unique geometric design results in tremendous amount of surface area for bacterial growth. 100 bio balls will support approximately 15-30 gallons of marine life. Recommended use for both Salt Water, Fresh Water Aquariums and also Ponds! Each ball measures approximately 1.25" around, 100 balls is equal to .75 cubic feet of space. For best results measure the space you are looking to fill (over flow tank or filter reservoir) or use the gallon size capacity listed in your owners manual.
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