Enjoy cleaner, fresher-tasting drinking water with the iFilters RP-3500 compatible replacement carbon block filter set for Royal Prestige FrescaPure 3500 drinking water filtration systems. Designed as a compatible alternative to WF0451 replacement filters, these cartridges provide a direct-fit, OEM-style replacement option for routine maintenance. Battery not included. Each filter is built with high-purity activated coconut shell carbon in a dense 0.5 micron carbon block design. This fine filtration structure is tested to reduce fine particulates, cysts, organic contaminants, sediment, dirt, rust, sand, and suspended particles while increasing water contact time to help reduce chlorine taste and odor, chloramine, VOCs, bad taste, and odor. The premium carbon block media helps reduce lead, VOCs, chloramine, chlorine taste and odor, bad taste, odor, and common organic contaminants for cleaner, fresher-tasting drinking water. Use these filters to improve municipal tap water for drinking, cooking, coffee, tea, beverages, ice, and everyday household use. Each cartridge is designed to provide up to 1,000 gallons of filtration or approximately 6-12 months of normal household use depending on incoming water quality, water pressure, and daily consumption. These carbon block filters help reduce lead, cysts, chlorine taste and odor, chloramine, VOCs, sediment, dirt, rust, sand, and suspended particles, but they do not reduce Total Dissolved Solids. TDS reduction typically requires a reverse osmosis filtration system.