Quickly Clears Cloudy Water Safe For All Fish, Plants and Invertebrates Improves Filter Efficiency Fritz Crystal Clear is best suited for use on cloudy or hazy aquarium water where filtration alone isn't enough to clear it. The clarifier works by pulling together the free floating particles in the water which are causing the cloudiness and, therefore, allowing them to settle on the bottom or get picked up by your filter. We recommend waiting at least 24 hours between doses and doing a partial water change in between dosing. Recommended Dosing: Use 1 tsp (5 ml) per 10 U.S. gallons (38 L) Fritz Crystal Clear will not affect beneficial bacteria, pH or other important water parameters. Safe and effective for use in freshwater, saltwater, reef aquariums and ponds. 100% phosphate free; safe for all fish, plants and invertebrates; will not contribute to future cloudy water problems.