Top 10 WGB21B Filters – Replacement Under-Sink Water Filters

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1. iSpring

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ISpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, Big Blue 5-Micron 10"x4.5", 4.5"x4.5"x10"

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iSpring #ad - No leaching carbon ash. Individually sealed for freshness. Long filter life filters up to 50, 000 gallons depending on the use and feed water quality. Great compatibility official replacement filter for ispring under sink water filter system US21B and Whole House water filtration systemsWGB21B, WGB21BM, and WGB21B-PB.

Free of surfactants, and adhesives. Steady flow and high absorption. Exceptional filtration performance knocks out cloudiness as well as bad tastes and odors, and is highly effective on Organic Compounds like herbicides, removes up to 99% of chlorine, and industrial solvents and other contaminants like trihalomethanes. Peace-of-mind customer support your risk-free shopping experience is backed by a 30-day money-back guarantee and lifetime tech support from iSpring in Atlanta, GA. Fits other standard 10" x 4. 5"big blue undersink and whole house water filtration systems.

Premium quality material using high-quality coconut shell carbon and highly compact fabrication tech, Taste, this highly activated carbon block CTOChlorine, binders, and Odor filter cartridge is designed and produced to achieve maximum filtration efficiency and filter life for 10" Under Sink Water Filter and Whole House Water Filtration Systems. Replace the filter every 6 months or every 50, 000 gallons of water for optimal performance. Usually used as the second stage filter for whole house water filtration systems, FC15B brings clean and refreshing water to every faucet in your home.
BrandiSpring #ad
ManufactureriSpring Water Systems #ad
Height10 Inches
Length4.5 Inches
Weight0.9 Pounds
Width4.5 Inches
Part NumberFC15B
ModelFC15B
Warranty30-Day Money Back Guarantee and Extended Warranty upon Registration. Lifetime CS and tech support from Atlanta, GA.

2. iSpring

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White, iSpring F4WGB21B Whole House Filtration High Capacity Sediment and CTO Carbon Block Water Filter Replacement Cartridge Pack Set for WGB21B, 4.5"x10"

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iSpring #ad - Great compatibility this filter pack consists of two 10"x4. 5"sediment filtersfp15b and two 10"x4. 5" cto filtersFC15B. Premium quality material and multi-layer density tech complying strictly with fda standard cfr-part 177 and tested by independent third party against NSF/ANSI standardNSF/ANSI 42 for material safety and water quality, sand, dust, silt, rust, iSpring premium 5-micron polypropylene sediment filter FP15B captures dirt, and scale particles and extends the life of CTO carbon block filter.

Fine pp sediment filters and premium quality ctO filters not only bring clean and refreshing water to every faucet in your home, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup. The polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. Peace-of-mind customer support your risk-free shopping experience is backed by a 30-day money-back, extended manufacturer, and lifetime CS and tech support from iSpring in Atlanta, GA.

Individually sealed for freshness. Exceptional filter life this filter pack can filter up to 50, 000 gallons depending on the use and feed water quality. Fits standard 10" big blue whole house water filtration systems. Highly activated carbon block cto filter using high quality coconut shell carbon and highly compact fabrication tech, iSpring CTO filterFC15B knocks out cloudiness as well as bad tastes and odors, and is highly effective on organic compounds like herbicides, removes up to 99% of chlorine, and industrial solvents and other contaminants like trihalomethanes.
BrandiSpring #ad
ManufactureriSpring Water Systems,LLC #ad
Height10 Inches
Length9 Inches
Width9 Inches
ModelF4WGB21B
Warranty30-Day Money-Back Guarantee; Extended Warranty Upon Warranty Registration; Lifetime CS and Tech Support from Atlanta, GA.

3. iSpring

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Removes 99% of Chlorine, iSpring WGB22B 2-Stage Whole House Water Filtration System Big Blue with 20” x 4.5” Fine Sediment and Carbon Block Filters

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iSpring #ad - The second stage cto carbon Block filter is made of high quality coconut shell carbon for maximum filtration efficiency and filter life. With 1” npt inlet / outlet and Big Blue 20” x 4. 5” filter cartridges, the system has minimum impact on water flow up to 15 GPM and requires minimum maintenance. Peace of mind customer service: we stand behind our products and if you encounter any problems with any of our products please reach out to us immediately.

Top-notch quality: the first stage high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. We are happy to help! Register online to active extended manufacturer warranty with lifetime personalized support. Diy installation and maintenance: refer to our manual and our helpful youtube videos for easy DIY installation. Both filters have a capacity of 100, 000 gallons of water, enough to supply a family of four with clean water for a full year. This system is installed at the main water supply line in order to treat all the water in your home.

If you are interested in a filter that removes TDS consider our iSpring Reverse Osmosis RO systems. Both are tested by an independent third-party to meet NSF/ANSI standards. Please note: unlike an ro system, this system will not reduce total Dissolved Solids TDS, and instead keeps healthy minerals in your water. Protect your family and household appliance from sediment, pesticides, industrial solvents, herbicides, bad tasting water! Our system removes up to 99% of chlorine from water as well as up to 95% of sediment, rust, and more: say goodbye to smelly, chlorine, vocs, and various other contaminants.
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ManufactureriSpring Water Systems #ad
Height27.75 Inches
Length16.25 Inches
Weight33 Pounds
Width7.75 Inches
Part NumberWGB22B
ModelWGB22B

4. iSpring

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Fits Whole House Water Filtration System WGB21B-PB, 4.5"x4.5"x10", 10"x4.5", White, iSpring FCRC15B Lead Reducing Replacement Filter, Ultra High Capacity

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iSpring #ad - It also has a minimum impact on water flow up to 15 GPM and requires minimum maintenance. Lifetime tech support from Atlanta, GA. Protect your family and household appliance from lead our filter fcrc15b is specially designed for reducing lead.

Great compatibility being a perfect 2nd stage filter for iSpring WGB21B-PB, FCRC15B also fits standard 10” x 4. Tds note unlike an ro system, this system will not reduce total dissolved Solids TDS, and instead keeps healthy minerals in your water. 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.

5” housings from most brand name models. Easy to maintain the cartridge lasts up to 3 times longer than conventional media. Top-notch customer service backed by a 30-day money-back and extended manufacturer upon registration at iSpring. If you are interested in a filter that removes TDS, please consider our iSpring RO systems.
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ManufactureriSpring #ad
Height10 Inches
Length4.5 Inches
Width4.5 Inches
Part NumberFCRC15B
ModelFCRC15B
WarrantyWarranty and Support: By default every iSpring whole house water filtration system comes with thirty-day money back policy and one-year limited manufacturer warranty. We care and love to help customers. Besides DIY videos on YouTube and Knowledge Base on our website, we provide lifetime customer service from Atlanta, GA. Please don't hesitate to reach out to us before and after your purchase. Your satisfaction is our business!

5. iSpring

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ISpring F2WGB21B Whole House 4.5"x10" Water Filtration Big Blue High Capacity Sediment and CTO Carbon Block Water Filter Replacement Cartridge Pack Set for WGB21B

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iSpring #ad - Highly activated carbon block cto filter using high quality coconut shell carbon and highly compact fabrication tech, removes up to 99% of chlorine, iSpring CTO filterFC15B knocks out cloudiness as well as bad tastes and odors, and is highly effective on Organic Compounds like herbicides and industrial solvents and other contaminants like trihalomethanes.

Great compatibility this filter pack consists of 1x 10"x4. 5"sediment filterFP15B and 1x 10"x4. 5" cto filterFC15B. Peace-of-mind customer support your risk-free shopping experience is backed by a 30-day money-back guarantee, and lifetime tech support from iSpring in Atlanta, extended manufacturer warranty, GA at 678 261-7611. Individually sealed for freshness. The polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. Fits standard 10" big blue whole house water filtration systems. Fine pp sediment filter and premium quality cto filter not only bring clean and refreshing water to every faucet in your home, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.

Exceptional filter life this filter pack can filter up to 50, 000 gallons depending on the use and feed water quality. Premium quality material and multi-layer density tech complying strictly with fda standard cfr-part 177 and tested by independent third party against NSF/ANSI standardNSF/ANSI 42 for material safety and water quality, iSpring premium 5-micron polypropylene sediment filter FP15B captures dirt, sand, silt, dust, rust, and scale particles and extends the life of CTO carbon block filter. Replace the filters every 3-6 months to achieve optimal performance.
BrandiSpring #ad
ManufactureriSpring Water Systems #ad
Height4.5 Inches
Length10 Inches
Weight3 Pounds
Width4.5 Inches
Part NumberF2WGB21B
ModelF2WGB21B
Warranty30 day warranty

6. iSpring

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ISpring WSP50ARB Reusable Whole House Spin-down Sediment Water Filter 50 Micron with Scraper and Touch-Screen Auto Flushing Module, Brass Top with Clear Housing

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iSpring #ad - Used to create a multi-layer gradient filtration system taking considerable workload off finer filters that follow it and result in a longer filter life. No welding or glue needed. Works well with copper, and CPVC pipes. Integrated auto flushing moduledual power supply with scraper saves time and effort on routine maintenance.

System can be installed in any direction thanks to the 360° rotatable head connection. Provide a maximum flow rate of 35 gpm. Two types of threads on both two ends of connectors: 1-inch mnpt and 3/4-inch FNPT or 3⁄4-inch push-fit plumbing fittings. Choose from auto, semi-auto, and manual on HD touch screen to enable the system to flush automatically on a preset schedule. Lifetime tech support from iSpring.

Easy installation. Parts included: two ¾” push-fit plumbing fittings, 1 circlip, 1 power adapter, 3 AA batteries for touch-screen Auto Flushing Module. Pressure-resistant and durable materials: lead-free brass machine head, 50-micron food grade stainless steel mesh filter screen, PEX, and explosion-proof transparent housing. As a larger, rust, sediment, upgraded version of WSP series, WSP50ARB filters out particulate, and floating objects. Flushable and reusable.
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ManufactureriSpring Water Systems #ad
Height4 Inches
Length13.8 Inches
Weight4.25 Pounds
Width5 Inches
Part NumberWSP50ARB
ModelWSP50ARB
Warranty1-year warranty

7. iSpring

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ISpring, WSP50 WSP-50 Reusable Whole House Spin Down Sediment Water Filter 50 Micron, 1" MNPT + 3/4" FNPT, Brass

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iSpring #ad - Rated at 50 micron. 40 - 100f, 20 - 100 psi, for indoor use only. Ideal frontier water filter protecting your entire plumbing system from sediment, dirt, rust, sand, and large particles.

Solid lead-free brass machine head with stainless steel mesh filter screen that usually lasts 1 - 2 years. Contact us for screen replacement in different size. Easy installation with double threads: 1-inch mNPT and 3/4 inch FNPT on both ends, garden hose barb fitting on flush out valve. Flushable and reusable takes the considerable workload off finer filters that follow behind it; unlike traditional sediment filters, regular flushing keeps the WSP performance in control. Note: screens with 50 or 100 microns may be clogged very soon for water with high sediment content. See-through housing provides easy visual monitoring.
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ManufactureriSpring Water Systems #ad
Height9 Inches
Length3.5 Inches
Weight1 Pounds
Width3.5 Inches
Part NumberWSP50
ModelWSP50

8. iSpring

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5-Micron Universal Coconut Shell High Capacity CTO Filter for Under Sink and Whole House Water Filtration Systems, iSpring FC15BX4 4.5" x 10" Carbon Block Water Filter Replacement Cartridge, Pack of 4

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iSpring #ad - Exceptional filtration performance knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is highly effective on organic compounds like herbicides and industrial solvents and other contaminants like trihalomethanes. Replace the filter every 6 months or every 50, 000 gallons of water for optimal performance, depending on the quality of source water and daily water consumption.

No leaching carbon ash. Great compatibility fits standard 10"x4. 5" filters. All 4 cartridges are individually sealed for freshness. Peace-of-mind customer support your risk-free shopping experience is backed by a 30-day money-back guarantee, and lifetime tech support from iSpring in Atlanta, extended warranty upon registration, GA. Official 2nd stage carbon block replacement filter cartridge for iSpring under sink water filter US21B and whole house water filtration system WGB21B; 1st stage for WGB21BM and WGB21B-PB.

Long filter life each cartridge filters up to 50, 000 gallons depending on the use and feed water quality. Free of surfactants, this highly activated carbon block CTOChlorine, binders, and adhesives. Premium quality material using high-quality coconut shell carbon and highly compact fabrication tech, Taste, and Odor filter cartridge is designed and produced to achieve maximum filtration efficiency and filter life for 10" Whole House Water Filtration Systems. Steady flow and high absorption.
BrandiSpring #ad
ManufactureriSpring #ad
Height10 Inches
Length5 Inches
Width5 Inches
Part NumberFC15BX4
ModelFC15BX4
WarrantyExtended Warranty upon Registration and Lifetime CS and Tech Support from Atlanta, GA.

9. iSpring

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ISpring WSP50GR Reusable Spin Down Sediment Water Filter 50 Micron w/Scraper & 360°Head, Blue

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iSpring #ad - High impact stainless steel mesh filter screen rated at 50 Micron. Flushable and reusable, takes considerable workload off finer filters that follow behind it; helps create a multi-layer gradient filtration system for better filtration results and longer filter life.

Double threads on both ends: 1 inch MNPT and 3/4 inch FNPT, 1/4" flush out fitting included. Lifetime support from iSpring. The steel mesh filter cartridge and housing can be easily cleaned by rotating the scraper, saving time and effort on routine maintenance. System can be installed in any direction thanks to the 360° rotatable head connection.
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ManufactureriSpring Water Systems #ad
Height4.5 Inches
Length9.5 Inches
Weight0.18 Pounds
Width2.5 Inches
Part NumberWSP50GR
ModelWSP50GR
Warranty1 year manufacturer

10. CFS COMPLETE FILTRATION SERVICES EST.2006

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4.5" x 10" by CFS, Compatible to iSpring FC15B Big Blue Whole House Water Filter with CTO Carbon Block

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CFS COMPLETE FILTRATION SERVICES EST.2006 #ad - Gac filters. Radial flow outside-to-inside filtration provides increased dirt-holding capacity. Optimized to perform as both a sediment and activated carbon filter. Competitively Priced vs. Compatible to ispring fc15b big blue whole house Water Filter with CTO Carbon Block, 4. 5" x 10" by CFS. Drop-in cartridge provides quick and easy filter change.
BrandCFS COMPLETE FILTRATION SERVICES EST.2006 #ad
ManufacturerCFS COMPLETE FILTRATION SERVICES EST.2006 #ad
Part NumberCFS-406
ModelCFS-46