Economical Replacement Filter Pack: This pack includes one 10”x4.5” GAC+KDF water filter (FG15B-KS) and one 10”x4.5” CTO carbon block filter (FC15B) - the official replacements for the iSpring whole house water filtration system WGB21B-KS. Enjoy continuous access to clean and healthy water with this cost-effective filter set.
What's Included?
Filter Cartridge
Features
Advanced 1st Stage Filter (FG15B-KS): The 10” x 4.5” compound filter is designed to remove a wide range of contaminants, including chlorine, lead, mercury, hydrogen sulfide, THMs, chloramines, herbicides, odors, and other impurities. Made with high-quality coconut shell carbon and advanced fabrication technology, it ensures superior filtration performance.
Highly Effective 2nd Stage Filter (FC15B): The 10” x 4.5” CTO carbon block filter knocks out cloudiness, bad tastes, and odors, while effectively removing up to 99% of chlorine. It is also highly efficient in eliminating herbicides and industrial solvents.
Individually Sealed for Freshness: Each filter is individually sealed to maintain maximum freshness and ensure top-notch performance. Replace the filters every 8-12 months, depending on the source water quality, to achieve optimal filtration results. For easy filter change tips, refer to our manual and helpful YouTube videos.
Preserve Essential Minerals: Please note that this filter pack is NOT designed to reduce Total Dissolved Solids (TDS). It allows essential minerals to remain in your water, promoting better taste and overall well-being. If you prefer a filter that removes TDS, consider exploring our iSpring Reverse Osmosis (RO) systems like RO500, RCC7, RO100, and more.
Other Dimensions
Overall Dimensions
10'' H X 4.5'' W X 4.5'' D
Overall Product Weight
4.2 lb.
Details
Filter Component
Replacement Filter
Location in Home
Whole House
Contaminants Removed
Chlorine Taste and Order
Finish
White
Pieces Included
Mounting Hardware, Filter Cartridge
Part Number
F2WGB21BKS
30-Day Return Policy
Not loving it? We offer returns for most items within 30 days of delivery for a refund or store credit.
iSpring F2WGB21BKS Whole House 4.5"x10" Water Filtration CTO Carbon Block and GAC+KDF Water Filter Replacement Cartridge Pack Set for WGB21B-KS F2WGB21BKS
Earn 5% back¹ in rewards, plus more exclusive perksEarn 5% back¹ in rewards, plus more exclusive perks
Get $40 off your qualifying first order of $250+** with the Wayfair Credit Card! Valid through 5/7/2026.Get $40 off your qualifying first order of $100+** with the Wayfair Credit Card! Valid through 5/7/2026.