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 filterr 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 hoursr for all freshwater aquariumsr not suitable for algae control