It is recommended to replace filter every month, but the actual frequency may vary depending on water and usage conditions The clear window of 360 degree rotating sink filter allows you to inspect filter and check it needs changing The short swivels joint is ideal for use in sinks or basins with low water outlets, while the mediums and long hoses should be used in kitchens or balconies with high water outlets The metal swivels joint provides flexibility in positioning filter, allowing for 360 rotation and twisting to fit any water outlet Multiple layers of microfiber filtering cotton provide effective filtration of impurities such as rust, sediment, and fine particles