Features: Class 1 Chlorine, Taste & Odor Reduction with Lead Removal Metsorb Lead Removal Media is made in the USA by Graver Technologies & is NSF Certified Made with Premium Quality Coconut Shell Activated Carbon 1 Micron Filtration No Release of Carbon Fines Fits all Standard 10" Filter Housings, Reverse Osmosis Systems (including all H2O Filter Warehouse, Watts, & Hydrotech) and Under Sink Systems 1,500 Gallon capacity for lead removal with 1 PPM Chlorine Flow rate: 1 GPM Cartridge is designed for use in Under Sink Filtration & Reverse Osmosis Applications, but not for whole house applications. Cartridges are individually shrink wrapped. Manufactured by Wel Han Environmental aka CA Ware. Two Pack of Carbon Block Cartridge Removes Chlorine, Taste & Odor 1 Micron Filtration Lead Removal Fits Standard 10" Housings