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Internet #306185026

Model #WGB21B

Store SKU #1003404072

2-Stage Whole House Water Filtration System with 4.5 in. x 10 in. Sediment and Carbon Block Filters

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  • Enjoy clean water from every faucet of your whole house
  • Reduces sediments, chemicals, and up to 99% of chlorine
  • Filters up to 50K Gal. of water or lasts up to 12 months
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Product Overview

The WGB21B is a great "point of entry" filtration system and an excellent alternative to the larger WGB22B (4.5"X20") for smaller homes or where limited space may be a concern. The WGB21B will filter water directly from your source. This means that water from every outlet in your home will have passed through this filter, providing up to 50,000 Gal. of clean water for the entire family. The first stage of this system houses a 5-micron high-capacity polypropylene sediment filter (FP15B). This filter is responsible for removing dirt, rustand most suspended solids, to protect and extend the life of the CTO carbon block filter. The second stage houses the 5-micron CTO coconut shell carbon block filter (FC15B). Block carbon is more effective than other forms of carbon in that it is finely ground up carbon packed into a solidified block. This means they have a higher density than other types of carbon filters and are therefore more effective in removing their targeted contaminants. The carbon block filter knocks out bad tastes and odors, removes over 90% of sediment and chlorineand is highly effective on organic chemicals (VOCs) like pesticides, herbicidesand industrial chemicals. If you are on city water, your local water utility must meet very strict Federal and State standards for purity. Almost all municipally treated water is chlorinatedand this can affect taste and create odors in the water. The WGB21B filtration system will remove these tastes and odors.
  • Two-Stage Effective Filtration: 1st-Stage 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. Using high quality coconut shell carbon and highly compact fabrication tech, 2nd-stage CTO filter(FC15B) knocks out cloudiness as well as bad tastes and odors, removes over 90% of chlorine, and is highly effective on VOCs like pesticides, herbicides, and industrial solvents and other contaminants like trihalomethanes.
  • Superb Filtration Capacity: 10"x4.5" replaceable whole house water filters can provide up to a full year of clean water(up to 50,000 gallons) for a family of four. 1-inch inlet and outlet ports allow fast water flow with less pressure loss. Fine PP sediment filter and premium quality CTO filter not only bring clean and fresh water to every faucet in your house, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.
  • Easy Installation and Filter Change: The system comes pre-assembled onto the mounting bracket for a streamlined, DIY installation. Filter wrench included to make routine filter changes easy and quick. A pressure release valve allows for the release of built-up pressure when changing filters. Refer to our manual and/or YouTube videos to Install this point-of-entry (POE) filtration system at the main water supply to get clean and healthy water for the entire family.
  • Top-Notch Customer Service: Backed by a 30-day money-back guarantee and extended manufacturer warranty upon warranty registration at iSpring. Lifetime tech support(678-261-7611) from Atlanta, GA USA.
  • 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, consider our iSpring Reverse Osmosis (RO) systems.

Additional Resources

From the Manufacturer

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Save $33.74 (15%)
Contaminants FilteredChlorineLead, Chlorine, Copper Chlorine
House Hold Size5-6 people3-4 people3-4 people5-6 people
Filtration MethodCarbon Block,SedimentCTO,Coconut Shell Carbon,GAC,KDF,Polypropylene,SandCarbon Block,Carbon Spun Fiber,SedimentCarbon Block,Sand
IncludesFilter,Installation kitFilter,HardwareInstallation kitInstallation kit
FeaturesNo additional featuresNo additional featuresIndicator light(s)No additional features
Application TypeFood Service,Industrial,Office,RV,Water Treatment,Well WaterIndustrial,Inline,Office,Water Treatment,Well WaterWater TreatmentFood Service,Industrial,Office,Water Treatment,Well Water
Replacement Filter TypeWhole House Replacement FiltersWhole House Replacement FiltersWhole House Replacement FiltersWhole House Replacement Filters
Smart Home Smart Home Enabled
View ProductView ProductView ProductView Product



Fitting size (in.)1.0Product Depth (in.)8.25 in
Product Height (in.)17.5 inProduct Width (in.)16 in


Application TypeFood Service,Industrial,Office,RV,Water Treatment,Well WaterBacteria Reduction (%)0
Chlorine reduction (%)95Color/FinishSediment and CTO
Contaminants FilteredChlorineCopper Reduction (%)0
FeaturesNo additional featuresFiltration MethodCarbon Block,Sediment
Fitting styleThreadedFluoride Reduction (%)0
House Hold Size5-6 peopleIncludesFilter,Installation kit
Indoor/OutdoorIndoorIron Reduction (%)0
Lead reduction (%)0Maximum feed water pressure (psi)80
Maximum feed water temperature (F)100Maximum filtered water flow (gallons per min.)15
Minimum feed water pressure (psi)40Minimum feed water temperature (F)40
Number of filters included2Number of Stages2 Stage
Pack Size1Product Weight (lb.)21 lb
Replacement Filter TypeWhole House Replacement FiltersReturnable90-Day
Water Filtration System TypeWhole House

Warranty / Certifications

Certifications and ListingsNo Certifications or ListingsManufacturer Warranty30-day Money Back 1-year limited warranty life-time tech support

Questions & Answers

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Customer Reviews

  • 4.5
    out of 105 reviews
  • 91%recommend this product
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Showing 1-10 of 105 reviews
The Perfect Addition To My Filter System
I purchased this 2-Stage water filter system to put between the iSpring while house water filter system tank and my iSpring UV filter system to remove additional particulates in my water. The construction and material for this is extremely heavy-duty and provides very simple installation. Be sure to get your water tested to find out what type of filters are necessary for your water. I certainly recommend this product and can honestly say that I am extremely satisfied with it.
    • Recommended
    I love ISPRING
    I only use their products. This is my latest system at new house. We have a well. Our water is awesome and there's no scale on the fixtures whatsoever or hard feeling to water. Awesome product. I have no room in the house for a softener nor do I need one thanks to the quality and effectiveness of these products.
      • Recommended
      Great tasting water. Excellent customer support
      Thanks to Don at ISpring for his installation support. We are now enjoying great tasting water from our well. Our system consists of the following ISpring products: 50um spin down pre-filter, 5um sediment filter, iron and manganese filter, scale removal filter and 5um activated charcoal filter.
        • Recommended
        Very easy to assemble and install
        Very easy to assemble and install
        • Verified Purchase
        • Recommended
        At first this system was great. The smell was...
        At first this system was great. The smell was gone like it said it would do. But after 12 days the smell started to come back. I pulled the filter to look at it and it was brown. It said the filter was good for 3-6 months. It made 12 days. I just had to order another set of filters and a second set for a backup. The new filters won’t be here until September 4th. I hope things start to turn around or it will be a waste of money and time.
        Response from iSpring Water SystemsSep 9, 2020

        This could be caused by high levels of Nitrate in your source water that is fouling the filters quickly. Please contact the office at 678-261-7611 or support@123filter.com for assistance.

        Thank you,

        iSpring Water Systems LLC iSpringWaterSystems
        • Verified Purchase
        3 found this review helpful
        Nothing but problems
        Had a leak from the first day I installed it. Got in touch with the manufacturer by email. After the run around of filling forms for warranty, was answered to take it all apart, what was assembled by them at the manufacturer and to rap extra Teflon Tape ! Yes you see I had to redo their wrong doing ! The problem was not even that it had a small hair line crack. So buyer's, beware if you can look elsewhere for a quality assembled whole house Water filter.
        Response from iSpring Water SystemsAug 18, 2020
        Hi Art2,

        We are sorry to hear that you had an issue with the system that was not resolved. Could you please contact the office at 678-261-7611 or support@123filter.com and ask for our QA manager Nick. He can assist you with reparing the system.

        Thank you,

        iSpring Water Systems LLC iSpringWaterSystems
        • Verified Purchase
        So Far its working great!
        I purchased this unit after reading alot of reviews. We suffer from well water, rotten egg smell and sediments, in the water. I had to clean out my washing machine hot water hose due to calcium sediments blocking the water. I had my plumber install the system in my garage. I immediately noticed the rotten egg smell was gone. I’ve had it for two weeks and so far so good. I’m not sure how long my filters will last but hopefuily at least 6/12 months. I would recommend they make the filter housing clear instead of blue so you can see your filter and the condition of it.
          • Recommended
          4 found this review helpful
          No change in TDS
          I bought this because of the great reviews, had a professional plumber install it. My TDS numbers stayed exactly the same, my TDS score was 667, before and after. Any ideas? I’m attaching picture.
          Response from iSpring Water SystemsMay 13, 2020
          Hi Jfranzke,

          Thank you for posting a review. This will allow us to know how our customers feel about our products.

          Our whole house systems including yours are not recommended for TDS rejection. You need an additional undersink Reverse Osmosis system to lower your TDS. For additional troubleshooting, please call us or visit our website and click the "Support" link on top to create a support ticket. We will respond within 24 business hours.

          Kind Regards,

          iSpring Water Systems iSpringWaterSystems
            Good Basic Water Filtration Unit
            Installation was straightforward. Bypass diagram in the manual was incorrect, also no mention of thread sizes for mating plumbing (uses 1” NPT threads), cartridge installation straightforward. Water was cloudy for a few hours after the unit was installed but cleared up after a few hours.
            • Verified Purchase
            • Recommended
            My water is finally drinkable!
            Very easy to install. Head unit is directional, instructions included to disassemble and reassemble to change the direction, but I just went to the next joist and installed it backward, which accomplishes the same thing. Used PEX and Sharkbite fittings, so once I decided on location it took less than 10 minutes to install. After the required flush, the water is great! No more chlorine bite. I now refill my own water cooler bottles from it as well, better than the Primo machiine.
            • Verified Purchase
            • Recommended
            Showing 1-10 of 105 reviews