Our REPLACEMENT FILTERS: UC Replacement Filters are designed to fit standard under counter units. These filters are made from the highest quality materials, ensuring efficient filtration and a long lifespan. They are easy to install and maintain and can be used with a range of standard under counter units. The REPLACEMENT FILTERS: UC Replacement Filters are an ideal choice for those looking for a reliable and effective filter replacement. The package comes with three filters, inline, and two ten in filters. We recommend replacing all three filters at the same time. They all have separate functions. Rotating filters is now not recommended.