General description AlwaysH Aquarium Filter Balls are designed to purify and degrade toxic and harmful substances in water, ensuring a suitable living environment for fish. These 100 pieces of biochemical cotton filters are effective in restoring natural water quality and enhancing the overall health of your aquarium. Technical specifications Quantity: 100 pieces Diameter: 16 mm Compatibility and accessories Suitable for UVC filters Compatible with external filters Can be used in filter basins for aquariums or ponds Usage Enhances the effect of bacterial filtering Provides a large surface area for bacteria, achieving high efficiency in biological filtration Ideal for both freshwater and saltwater aquariums, including mini reef aquariums Other information Lightweight and easy to carry Filter balls do not need to be replaced unless damaged or destroyed Excellent for oxygenating water and facilitating gas exchange