The Culligan R50-BBSA coarse particles filter cartridge reduces sediment, rust, scale, dirt, and coarse sand. The filter is recommended for use with city and well water supplies. This filter is designed as a whole-house replacement filter for the Culligan HD-950A. The filter has a pleated design that provides up to 50% more surface area than standard filters, resulting in longer life and more efficient filtration. The filter's unique design also allows for easy replacement with no tools required.