[Protect Your Family and Household Appliance from Lead] Our filter (FCRC15B) is specially designed for reducing lead. It features a high capacity of 80, 000 gallons of water, effectively reducing lead level from 100 ppb to 15 ppb (the EPA standard for drinking water) and less. [Great Compatibility] Being a perfect 2nd stage filter for iSpring WGB21B-PB, FCRC15B also fits standard 10” x 4. 5” housings from most brand name models. [Easy to Maintain] The cartridge lasts up to 3 times longer than conventional media. It also has a minimum impact on water flow (up to 15 GPM) and requires minimum maintenance. [Top-Notch Customer Service] Backed by a 30-day money-back and extended manufacturer upon registration at iSpring. Lifetime tech support from Atlanta, GA. [TDS Note] Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, please consider our iSpring RO systems.