iSpring WGB21B 2-Stage Whole House Water Filtration System w/ 4.5" x 10" Sediment and Carbon Block Filters Filters up to 15 gallons per minute of water for your entire home with 1" input and output ports Unlike an RO system, this system will NOT reduce TDS. Total Dissolved Solids (TDS) is a measurement of everything in your water, both good and bad. It's not an accurate measure of water quality. Two stages of filtration - removes up to 95% of VOCs, sediment, chlorine, and other contaminants that cause foul tastes and odors 50,000 gallon capacity 4.5"X10" replaceable filters can provide up to a full year of clean water for a family of four The system comes pre-assembled onto the mounting bracket for a streamlined, DIY installation Pressure release valve (allows for release of built-up pressure when changing filters) 1 year money-back guarantee Lifetime tech support from iSpring in Alparetta, GA at (678) 261-7611