General description AlwaysH 1 Pack Aquarium Air Stone Cylinder is designed for larger air pumps, providing an efficient air bubble diffusion system for ponds, gardens, and large aquariums. It produces medium bubbles through numerous micro-holes, ensuring abundant and consistent aeration. Technical specifications Dimensions: 5 x 20 cm (D x L) Compatibility and accessories Suitable for large tanks such as ponds, gardens, and some large aquariums or DWC systems Not suitable for small aquariums Installation Soak the air stone completely in water for more than 3 hours before use Usage Clean regularly with a brush to prevent clogging after weeks or months of use