For crystal clear aquarium water. Safely and reliably removes dirt particles that cloud the aquarium water, making it crystal clear for the well-being of your fish and plants. Binds small particles into larger ones that can be filtered from the water by the aquarium filter. The first effects will be visible after 2-3 hours. The water will be clear within 6-8 hours and crystal clear after 6-12 hours. For all freshwater aquariums. Not suitable for algae control.