The first stage of mechanical filtration involves pumping water into the filter to generate the pressure required to start the process. Two foam discs gather unwanted organic debris of different sizes, which promotes the growth of numerous beneficial bacteria that degrade dangerous pollutants. The water goes through the bio-balls at the bottom of the filter in stage two, which is biological filtration. In order to maintain a healthy pond environment, these have a large surface area and offer a home for beneficial bacteria that naturally transform the toxic substances of ammonia and nitrites into useful nitrates. The third step is UV clarification, which produces crystal-clear water by clumping and killing any microscopic suspended algae spores in the water. Qualities: