Fritz Aquatics Water Clarifier for AquariumsCloudy, discolored water is caused by overfeeding, biological blooms, gravel dust and other suspended particles that are too fine to be removed by mechanical filtration and stay in the water column. Fritz Clarifier rapidly clears water by pulling together (flocculating) fine particles, allowing them to be removed by the filter or settle to the bottom, leaving your aquarium crystal clear Quickly clears cloudy water Made in the USA Improves filter