100 percent compatible with Rhino Whole House Water Filters that contain a 20 inch pre-filter. The Smart Pack SP-EQ-304-20-4PK is the Smarter Alternative to the EQ-304-20. This Smart Pack set is fully comparable in quality and performance to the original EQ-304-20 filters at a much better price. Designed to fit the EQ-600-PRO, EQ-1000 and EQ-WELL-UV whole house filtration systems as well as other brand 20" filter housings. These sediment filters increase the performance of filtration units by filtering sediments and dirt that would otherwise clog the filtration system. These filters are 2.5" x 20" and are made from 100 percent NSF Approved Polypropylene. Designed to handle bad sediment and bad water, these filters have a unique multi-depth filtration to allow maximum flow while providing maximum filtration. The outer part of the filter traps the larger particles and tightens up as the water flows inward. The inner core provides a tighter micron rating to further filter contaminants that get passed the first few layers of the filter. This multi-depth process allows the filter to maximize the filtration performance and filter life. Insure to replace your filters when pressure drops or every 3 months depending on your sediment levels and local water quality. Trusted by thousands worldwide, Smart Pack Water Filters offer Premium replacement filters at an unbeatable price. All filters are designed, tested and certified to the highest levels to insure maximum performance, quality and compatibility.