Fluval Bio Clear (4 oz) is a biological water clarifier that uses natural enzymes to eliminate cloudy water caused by organic waste and bacterial blooms. It rapidly breaks down and clears haze due to new tank syndrome, overfeeding, or decaying matter (like dead plants or excess food). By targeting these biological causes of cloudiness, Bio Clear restores your aquarium water to crystal clarity and helps maintain a healthy, balanced environment without the use of harsh chemicals.