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iSpring WGB21B
- Whole-house
- Point of entry
- City water
- Well water
- Complete system
- No listing
$155.99as of 2026-09-15MSRP $182.99 as of 2026-09-15
Secondary sourceVerified 2026-09-15Retailer listing
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Our verdict on the iSpring WGB21B
The iSpring WGB21B is a compact 2-stage point-of-entry sediment-and-carbon system for municipal or well water at 25-80 psi, sized for apartments, small homes or vacation properties. It is not a softener, reverse-osmosis unit, or bacteria/virus treatment system.[1][2]
Best for
- Apartments, smaller homes or vacation properties on municipal or well water with 25-80 psi feed pressure that want basic sediment, chlorine, taste and odor reduction in a compact 10" x 4.5" footprint
Not for
- Buyers who need fluoride, hardness/calcium, TDS, or chloramine reduction
- Well water needing coliform or iron-bacteria removal, since the system will not remove any kind of bacteria
- Hot-water lines, outdoor installation, or feed pressure and temperature outside 25-80 psi / 40-100 F
Primary sourceVerified 2026-09-15Brand officialManufacturer datasheet
Certification check: iSpring WGB21B
No listing found in the NSF, IAPMO R&T, and WQA directories as of 2026-09-15.
| Directory | Result | Listing |
|---|---|---|
| NSF | No listing found (checked 2026-09-15) | View listing |
| IAPMO R&T | No listing found (checked 2026-09-15) | No URL recorded |
| WQA | No listing found (checked 2026-09-15) | View listing |
Claimed vs. certified: iSpring WGB21B
| Contaminant | Status | Third-party listing | What the brand says |
|---|---|---|---|
| chlorine | Marketed only | No entry |
|
| sediment, rust, tastes, odors and herbicides | Marketed only | No entry |
|
What the iSpring WGB21B does not do
The WGB21B does not reduce total dissolved solids (TDS) and retains healthy minerals in the water. The iSpring WGB21B's recorded operating limits are feed-water pressure at least 25 psi and up to 80 psi, operating temperature at least 40 F and up to 100 F, source-water pH at least 6 pH and up to 9 pH, source-water hardness without an upstream softener up to 60 ppm, verified 2026-09-15.
The WGB21B does not reduce total dissolved solids (TDS) and retains healthy minerals in the water.[1]
Primary sourceVerified 2026-09-15Brand official
The WGB21B does not remove fluoride.[1]
Primary sourceVerified 2026-09-15Brand official
The WGB21B does not reduce hardness and is not a water softener; a separate softener is needed for hard water.[1][2]
Primary sourceVerified 2026-09-15Brand officialManufacturer datasheet
The WGB21B will not remove any kind of bacteria from the water, including coliform or iron bacteria, though it can improve odor and taste.[1]
Primary sourceVerified 2026-09-15Brand official
The WGB21B does not remove chloramine.[1]
Primary sourceVerified 2026-09-15Brand official
The WGB21B does not remove copper.[1]
Primary sourceVerified 2026-09-15Brand official
iSpring does not recommend the WGB21B for outdoor installation or exposure to freezing temperatures, extreme heat or direct sunlight; such damage voids the warranty.[1][2]
Primary sourceVerified 2026-09-15Brand officialManufacturer datasheet
Operating limits
| Parameter | Limit | What it means |
|---|---|---|
| feed-water pressure | at least 25 psi and up to 80 psi[1][2] | Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official |
| operating temperature | at least 40 F and up to 100 F[1][2] | Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official |
| source-water pH | at least 6 pH and up to 9 pH[1][2] | Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official |
| source-water hardness without an upstream softener | up to 60 ppm[1] | The manual's FAQ says a water softener is needed when source-water hardness is higher than 60 ppm, because hard water shortens whole-house filter cartridge life. Primary sourceVerified 2026-09-15Manufacturer datasheet |
Do not buy it for these situations
Water pressureDo not operate outside the manufacturer's 25-80 psi working-pressure range.[1]
Primary sourceVerified 2026-09-15Manufacturer datasheet
Well waterFor well water needing coliform, iron-bacteria or other microbial treatment, the WGB21B alone is insufficient since it will not remove any kind of bacteria.[1]
Primary sourceVerified 2026-09-15Brand official
How the iSpring WGB21B works
The iSpring WGB21B treats water in two stages: Sediment filtration, then Activated carbon, verified 2026-09-15.[1][2]
| Stage | Method | Media | Micron rating |
|---|---|---|---|
| 1 | Sediment filtration | PP (polypropylene) | 5 µm |
| 2 | Activated carbon | coconut shell carbon block CTO | Not recorded |
Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official
Fit and sizing: iSpring WGB21B
The iSpring WGB21B is a whole-house unit installed at the point of entry, for city water and well water. It is rated for 15 gpm of service flow, verified 2026-09-15.
| Form factor | Whole-house |
|---|---|
| Installed at | Point of entry (whole house) |
| Water source | City water and Well water |
| Service flow | 15 gpm[1][2] Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official |
| Operating pressure | 25–80 psi[1] Primary sourceVerified 2026-09-15Manufacturer datasheet |
| Operating temperature | 40–100 F[1] Primary sourceVerified 2026-09-15Manufacturer datasheet |
| Connection size | 1 in Female NPT[1] Primary sourceVerified 2026-09-15Brand official |
| Needs electricity | No[1] Secondary sourceVerified 2026-09-15Retailer listing |
What the iSpring WGB21B really costs
The iSpring WGB21B costs $155.99 as of 2026-09-15. Over ten years, including installation and replacement elements, the recorded total is $1,025.79.
DIY install[1]
Primary sourceVerified 2026-09-15Brand official
Replacement schedule
| Element | Replace | Cost per year |
|---|---|---|
| F2WGB21B annual two-filter set (FP15B sediment + FC15B carbon block) | every 12 months | $57.99 |
| FP15B supplemental mid-year sediment cartridge | every 6 months | $28.99 |
Primary sourceVerified 2026-09-15Manufacturer datasheetBrand official
Ten-year cost of ownership
| Purchase price (as of 2026-09-15) | $155.99 |
|---|---|
| Replacement elements, 10 × $86.98/year | $869.80 |
| Sum of the lines above (as of 2026-09-15) | $1,025.79 |
| Recorded ten-year total | $1,025.79 |
Warranty: One-year limited warranty against defects in materials and workmanship; registration at ispringfilter.com is required. (1 years)[1]
Primary sourceVerified 2026-09-15Brand official
Money-back guarantee: Thirty-calendar-day return window: full refund for unopened product returned in received condition; eligible unused open-box returns are reduced by a 15% restocking fee. (30 days)[1]
Primary sourceVerified 2026-09-15Brand official
Installing the iSpring WGB21B
DIY install, verified 2026-09-15.
Tools required
- safety glasses
- towels
- flat-head screwdriver
- deburring tools
- pipe cutter
- torch
- adjustable wrench
- medium crescent wrench
- plumber's tape
Primary sourceVerified 2026-09-15Manufacturer datasheet
Manufacturer documentation
- Install manual: https://www.ispringfilter.com/index.php?rt=account/download/startdownload&download_id=290 (accessed 2026-09-15)
- Install video: https://www.youtube.com/watch?v=K5klL6gOrVY (accessed 2026-09-15)
Ongoing maintenance
- Replace the FP15B polypropylene sediment cartridge — every 6 months
- Replace the FC15B carbon-block cartridge — every 12 months
- Replace cartridges sooner if water pressure or flow falls materially
Primary sourceVerified 2026-09-15Manufacturer datasheet
Track record: iSpring WGB21B
Amazon shows 4.6 out of 5 from 4,269 reviews as of 2026-09-15; iSpringFilter.com shows 4.8 out of 5 from 41 reviews as of 2026-09-15.
| Source | Rating | Reviews | As of |
|---|---|---|---|
| Amazon | 4.6 out of 5 | 4,269 | 2026-09-15 |
| iSpringFilter.com | 4.8 out of 5 | 41 | 2026-09-15 |
What owners praise
Amazon's AI-generated review-theme summary says customers find the system well worth its price, praise its heavy-duty build quality, and report the water tastes noticeably better with chlorine and sediment effectively reduced.[1]
Secondary sourceVerified 2026-09-15Amazon review
What owners complain about
Amazon's review-theme summary flags leakage as the most-mentioned negative theme, particularly around threaded connections and o-ring seals when changing filters, and shows mostly negative mentions of durability, including reports of the filter housing cracking.[1]
Secondary sourceVerified 2026-09-15Amazon review
Amazon's review-theme summary shows mixed experiences with odor reduction: most mentions are positive, but a meaningful minority report the system does not remove well-water odors or leaves a residual smell.[1]
Secondary sourceVerified 2026-09-15Amazon review
Recalls and litigation
None found as of 2026-09-15 in the sources cited below.[1]
Confidence unknownVerified 2026-09-15Government agency
The iSpring WGB21B against its family and its rivals
The iSpring WGB21B has 8 siblings in its family: WGB21B-PF, WGB21B-KS, WGB21B-CPB, WGB21BM, WGB21B-PB, WGB21B-DS, WGB21B-PFKS, WGB21B-KSNC.
The rest of the family
| Model | What differs |
|---|---|
| WGB21B-PF | Stage 2 is a PFAS-removal cartridge (FC15B-PF, rated 6 months) instead of the base model's carbon-block cartridge (FC15B, rated 12 months). |
| WGB21B-KS | Stage 1 is carbon-block CTO (FC15B) and stage 2 is a GAC+KDF cartridge (FG15B-KS), for broader heavy-metal and chlorine/chloramine reduction, instead of the base model's sediment-then-carbon-block train. |
| WGB21B-CPB | Stage 2 is a lead-removal CTO cartridge (FC15B-PB) instead of the base model's plain carbon-block cartridge (FC15B). |
| WGB21BM | Stage 1 is carbon-block CTO (FC15B) and stage 2 is an iron-and-manganese removal cartridge (FM15B), instead of the base model's sediment-then-carbon-block train. |
| WGB21B-PB | Stage 1 is carbon-block CTO (FC15B) and stage 2 is a lead-removal cartridge (FCRC15B), instead of the base model's sediment-then-carbon-block train. A different lead-removal cartridge pair than WGB21B-CPB. |
| WGB21B-DS | Stage 1 is carbon-block CTO (FC15B) and stage 2 is an anti-scale cartridge (FWDS80K), instead of the base model's sediment-then-carbon-block train. |
| WGB21B-PFKS | Stage 1 is a PFAS-removal cartridge (FC15B-PF) and stage 2 is a GAC+KDF cartridge (FG15B-KS), instead of the base model's sediment-then-carbon-block train. Broader than WGB21B-PF, which keeps the sediment pre-filter and only swaps stage 2 for PFAS removal. |
| WGB21B-KSNC | Stage 1 is a GAC+KDF cartridge (FG15B-KS) and stage 2 is a chloramine-removal CTO cartridge (FC15B-NC), instead of the base model's sediment-then-carbon-block train. |
iSpring WGB21B questions, answered
Does the iSpring WGB21B remove TDS?
Verified health claim
No. iSpring says the WGB21B retains healthy minerals and does not reduce total dissolved solids (TDS); a reverse-osmosis system is needed for TDS removal.
Sources: [1]
Does the iSpring WGB21B remove fluoride?
Verified health claim
No. iSpring's exact-model Q&A says this filter type is not capable of removing fluoride and recommends reverse osmosis or an activated-alumina filter instead.
Sources: [1]
Do I still need a water softener if I install a WGB21B and have hard water?
Can the iSpring WGB21B be used on well water?
Verified health claim
Yes, but iSpring's exact-model Q&A says the system will not remove any kind of bacteria, including coliform or iron bacteria, from well water, and recommends getting well water tested first.
Sources: [1]
Does the iSpring WGB21B remove chloramine?
Verified health claim
No. iSpring's exact-model Q&A says this system does not remove chloramine and points buyers to a different central water filter or a reverse-osmosis system for chloramine reduction.
Sources: [1]
How often should WGB21B filters be replaced?
Replace the FP15B sediment cartridge at no more than 6 months and the FC15B carbon-block cartridge at no more than 12 months, with earlier replacement if water pressure or flow falls.
Sources: [1]
What water pressure does the iSpring WGB21B require?
Does the iSpring WGB21B need electricity to run?
No. Amazon's exact-model listing lists the power source as No Need; the WGB21B runs on household water pressure alone.
Sources: [1]
Sources and data report: iSpring WGB21B
Every figure above is taken from the highest-trust source that carries it and re-derived from that source by a separate check. How we verify product data.
What we could not establish, and why
| Field | Why it is blank |
|---|---|
| identity.upc | The exact iSpring product page, current manual and exact Amazon PDP did not publish a UPC/GTIN for WGB21B. |
| certified.certIndexKey | The repository's partial certification index contains other iSpring models but no WGB21B or supplied-alias match; this null is only about the local corpus, while live directory checks are recorded separately and all three returned no-listing. |
| fit.bathroomsServed | The exact product page and current WGB/WDS manual publish flow rate but no bathroom-count rating for WGB21B. |
| fit.householdSize | Marketing copy for the WGB21B-PF sibling uses a family-of-four gallons-per-year example, but iSpring does not publish a supported household-size range for this model, so the example was not converted into a sizing claim. |
| fit.roOutputGpd | WGB21B is a non-RO whole-house sediment/carbon system, and neither the product page nor manual publishes an RO output. |
| fit.roTankCapacity | WGB21B is a tankless non-RO point-of-entry system; no storage tank is described anywhere in the product page or manual. |
| fit.dimensions | Three sources on the exact-model page and its Amazon listing disagree: the product page's Specifications block gives 16.00"L x 8.00"W x 18.00"H, the same page's Q&A widget separately answers 17 x 18 x 9 inches, and Amazon's own specifications table gives 26"L x 19"W x 11"H. With no way to determine which figure is correct or how L/W/H map to the schema's width/depth/height, and the schema requiring all three, the field was left null rather than picking one disputed number. |
| fit.requiresDrain | The manual describes depressurizing and draining housings during filter service but does not explicitly state whether a permanent drain connection is required for normal operation. |
| cost.wasteRatio | WGB21B is not an RO system and the product page and manual publish no reject-water or waste ratio. |
| install.difficulty | iSpring calls the job DIY and lists plumbing tools, but neither the exact product page nor the manual assigns an easy, moderate or hard difficulty rating. |
| install.estimatedHours | The current manual and manufacturer installation video provide steps but publish no installation-time estimate. |
| comparisons.familyCertNote | No checked directory listing for WGB21B, WGB21B-PF or any WGB-series alias supports a family-wide certification statement; other iSpring listings were not extended to this family. |
| seo.verification | The independent verify loop has not run yet; the pipeline leaves this null for the verifier to stamp. |
Every source behind this page
- Brand officialaccessed: 2026-09-15https://www.ispringfilter.com/ispring-wgb21b-2-stage-heavy-duty-whole-house-water-filtration-system-10x45-in-sediment-filter-and-cto-filter1in-inletoutlet
- The exact WGB21B product page identified Model: WGB21B and showed Availability: In Stock.
- The exact-model page's Q&A section says the system does not reduce TDS, does not remove fluoride, and will not remove any kind of bacteria from the water.
- The exact-model page's Q&A section says a water softener is needed separately if the customer has hard water, since the whole-house filter cannot soften water.
- The exact-model page's Specifications block lists Minimum Working Pressure 25 psi, Maximum Working Pressure 80 psi and Operating Temperature 40-100F.
- The exact-model page's Q&A section says the system should be kept in a sheltered location, never exposed to freezing, extreme heat or direct sunlight, with such damage not covered under warranty.
- The exact-model page's bullet copy says “Compact Yet Powerful: Ideal for apartments, smaller homes, or vacation properties, this 10” x 4.5” whole house water filter fits tight spaces while delivering long-lasting, high-performance filtration.”
- The exact-model product description identifies a 5-micron high-capacity polypropylene sediment filter (FP15B) as stage 1 and a 5-micron CTO coconut shell carbon block filter (FC15B) as stage 2.
- The exact-model Q&A confirms the first stage is the sediment filter (FP15B) and the second stage is the CTO carbon filter (FC15B).
- The About This Item section says the filter retains healthy minerals and does not reduce TDS, and the exact-model FAQ confirms it does not reduce TDS.
- The exact-model Q&A section states this filter type is not capable of removing fluoride and points buyers to reverse osmosis or activated-alumina filtration instead.
- The exact-model Q&A section says that if the customer has hard water they will need to add a water softener, because standard whole-house water filters cannot soften water.
- The exact-model Q&A section says this system will not remove any kind of bacteria from well water, including coliform, but can improve odor and taste.
- A separate exact-model Q&A answer says the system does not remove iron bacteria.
- The exact-model Q&A section says this home water system does not remove chloramine and points buyers to a different central water filter or reverse-osmosis system for chloramine removal.
- The exact-model Q&A section says this water filter system in particular does not remove copper and points buyers to a heavy-metal-focused sibling system instead.
- The exact-model Q&A section says the filter should be kept in a sheltered location, never exposed to freezing, extreme heat or direct sunlight, and that such damage is not covered under any warranty.
- The exact-model Specifications block lists Minimum Working Pressure 25 psi and Maximum Working Pressure 80 psi.
- The exact-model Specifications block lists Operating Temperature: 40-100 F.
- The exact-model Specifications block lists pH Range: 6 - 9.
- The exact-model Q&A section says the system will not remove any kind of bacteria from well water, including coliform or iron bacteria.
- The exact-model page states a strong water flow up to 15 GPM.
- The exact-model Specifications block lists Inlet / Outlet: 1 inch Female NPT.
- iSpring's exact WGB21B product page showed a regular price of $182.99, discounted 5% to a current price of $173.99.
- The exact-model Specifications block lists DIY Installation: Yes, with a manual and step-by-step video guide.
- iSpring listed the F2WGB21B replacement set at $57.99 and the standalone FP15B sediment cartridge at $28.99 on the exact-model page's related-products listing.
- The exact-model product page and FAQ say the WGB21B does not reduce TDS and retains healthy minerals.
- The exact-model Q&A section says the filter is not capable of removing fluoride.
- The exact-model Q&A section says a water softener is needed for hard water since standard whole-house filters cannot soften water.
- The exact-model Q&A section says the WGB21B can be used for well water but will not remove any kind of bacteria, and recommends water testing and calling iSpring for a personalized recommendation.
- The exact-model Q&A section says the WGB21B does not remove chloramine.
- The exact-model specifications list 25 psi minimum and 80 psi maximum working pressure.
- Manufacturer datasheetaccessed: 2026-09-15https://www.ispringfilter.com/index.php?rt=account/download/startdownload&download_id=290
- The current WGB and WDS Series Manual specifies 25-80 psi, 40-100F, pH 6.0-9.0, and lists the WGB21B stage 1/stage 2 sediment and carbon-block train.
- The manual's model table lists WGB21B/WGB21BC stage 1 as PP Sediment Removal (Model #FP15B) and stage 2 as Carbon Block CTO (Model #FC15B), with no stage 3.
- The manual's FAQ says a water softener is needed if source-water hardness is higher than 60 ppm.
- The manual requires the filter be kept in a sheltered location, never exposed to freezing temperatures, extreme heat, or direct sunlight, since damage from these conditions is not covered under warranty.
- The manual specifies a working pressure of 25-80 psi.
- The manual specifies a working temperature of 40-100F.
- The manual specifies a pH requirement of 6.0-9.0.
- The manual's FAQ recommends a water softener when source-water hardness is higher than 60 ppm.
- The manual specifies 25-80 psi working pressure.
- The manual lists a 3-15 GPM flow-rate range for the WGB series.
- The manual specifies working pressure of 25-80 psi.
- The manual specifies working temperature of 40-100F.
- The manual's filter-lifespan table gives FP sediment media a maximum 6-month life and FC carbon media a maximum 12-month life.
- The manual's Tools Required list names the recorded installation tools.
- Current WGB and WDS Series Manual opened and read for specifications, installation, treatment train and maintenance, including the WGB21B/WGB21BC row of the model table.
- The manual gives FP media a 6-month maximum, FC media a 12-month maximum, and says a slowing water pressure can indicate replacement is due.
- The manual's FAQ recommends a softener above 60 ppm hardness.
- The manual's lifespan table specifies 6 months for FP media and 12 months for FC media, and says a slowing pressure can signal replacement.
- Retailer listingaccessed: 2026-09-15https://www.amazon.com/iSpring-WGB21B-2-Stage-Filtration-Sediment/dp/B01F9A4UVU
- The exact-model Amazon product information lists Power Source as No Need.
- Amazon's exact-model WGB21B listing (ASIN B01F9A4UVU) showed a one-time-purchase price of $155.99.
- The exact-model Amazon PDP's Customers say summary and per-theme breakdowns showed predominantly positive mentions for value for money (134 of 159), water taste (82 of 86), water filtration (77 of 84), water quality (78 of 80) and build quality (70 of 75).
- The exact-model Amazon PDP showed 129 customers mentioning leakage (32 positive, 97 negative) around threaded connections and o-ring failures, and 78 customers mentioning durability (27 positive, 51 negative) including reports of the filter housing cracking.
- The exact-model Amazon PDP showed 72 customers mentioning odor reduction (50 positive, 22 negative), with the summary noting some customers find it doesn't remove well-water odors.
- Brand officialaccessed: 2026-09-15https://www.ispringfilter.com/return-policy
- iSpring's warranty terms state one year from purchase for defects in materials and workmanship and require end-user registration at ispringfilter.com.
- iSpring's return policy states the conditions for full and restocking-fee-adjusted refunds within 30 calendar days of purchase.
- Brand officialaccessed: 2026-09-15https://www.youtube.com/watch?v=K5klL6gOrVY
- iSpring's manufacturer-linked Step-by-Step Installation & Filter Replacement Guide for WGB series whole-house water filter systems was identified as covering the WGB21B's installation and filter-change steps.
- Government agencyaccessed: 2026-09-15https://www.cpsc.gov/search?search_api_fulltext=iSpring%20WGB21B
- The CPSC search for iSpring WGB21B returned No Results across all result categories.
Cite this page
TapWaterData Editorial. "iSpring WGB21B Review: Specs, True Cost & Cert Check." TapWaterData, verified 2026-09-15. https://www.tapwaterdata.com/filters/brand/ispring/wgb21b
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