All natural ZeoSand weighs half as much as its volume in sand yet is twice as effective. The crystal structure, irregular shell, and high surface area make it a highly effective trap for fine particulates and ammonium ions compared to sand. It takes less ZeoSand to fill a filter - 50 pounds of ZeoSand replaces 100 pounds of sand and makes a far more effective filter media. ZeoSand improves your sand filters performance by trapping more dirt and particles decreasing back wash time. ZeoSand removes eye-burning chloramines so you can enjoy superior water quality while saving energy and reducing chemical usage.