Culligan R50-BBSA Jumbo Filter Heavy Duty Sediment Replacement Cartridge, 1-Pack, White Fits HD-950 Level 1 Basic Filtration. Filter life up to 6 months or 24,000 gallons Filters Coarse (50-micron) sediment filtration: sand, rust and scale Dimensions - 4.3 inch x 4.3 inch x 9.75 inch Ideal for high-flow and well-water applications