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Tetra CrystalWater cleans dirt particles from the aquarium water fast, safely and reliably to help maintain a crystal water effect. It is completely harmless for all aquarium inhabitants and quickly provides crystal clear water. Initially, a white cloud will appear, which is not dangerous and clears away after a few hours. The active ingredients bind small particles in the water into larger ones that can then be filtered from the water by the aquarium filter. For best results the filter should be cleaned regularly.