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iSpring PFAS & Heavy Metals Whole House Filter
The iSpring Whole House Filter treats 100,000 gallons of water, so it suits you if you need a year of filtration.
100,000 gallons filtration capacity
- Filtration Capacity
- 100,000 gallons – below the 150,000 Gallons reference figure
- Inlet/Outlet Size
- 1 inch NPT
- PFAS Reduction Rate
- 99
- Filter Media Diameter
- 20 inch
Suits homeowners in pfas-contaminated zones
- Homeowners in PFAS-contaminated zones
- Families with high water usage
- Homeowners with well water containing sulfur
- Property managers of older buildings
$906 over the category median
- This A Whole House Water Filtration System
- $1310.99
- Median of the 52 Whole House Water Filtration Systems we screened
- $404.98
- Range
- $111.57 to $2476.67
- Cheaper than this one
- 49 of those 52
4.7/5 from 2,216 buyers
- Average buyer rating
- 4.7 out of 5
- Ratings behind it
- 2,216
- What that supports
- A large enough sample to read as a real buyer signal
- Where it comes from
- The product listing, read 10 November 2026
The iSpring Whole House Filter in Short
iSpring FC25B-PFKS Whole House Water Filter reduces up to 99% of PFAS for households requiring a high-capacity filtration system that treats up to 100,000 gallons of water.
A household with a high-flow demand can maintain consistent water quality for up to 12 months depending on usage and water conditions. The iSpring Whole House Filter supports this by providing a 100,000 gallon treatment volume, which allows a family of four to have filtered water for roughly 180 to 270 days.
By combining KDF and granular activated carbon (GAC) media, the iSpring Whole House Filter addresses both aesthetic and chemical concerns. The system is designed to reduce 99% of PFAS, a significant requirement for modern residential water treatment.
We evaluated 52 whole house water filtration systems and selected 15 for full review. This product was chosen because it is one of the most-rated options that passed screening, carrying 2,216 buyer ratings. Our review is based on a data-driven analysis of manufacturer specifications and ratings.
For a deeper dive into the technical capabilities of the larger unit, see our full review of the iSpring WGB21B-PF.
How Green Writer picked: we started from the 200 most-reviewed whole house water filtration listings in our retail dataset, removed duplicates, accessories, off-category products and 7 listings whose price did not fit their specifications, and 52 qualified. This product is one of 15 from that pool chosen for a full review. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked November 2026).
The Short Answer on the iSpring Whole House Filter
Best for: you need to remove PFAS and heavy metals from your home’s water supply while treating a large household’s needs for several months.
The iSpring Whole House Filter is a reliable choice for these requirements at $1310.99.
- Pro: The 99% PFAS reduction rate targets specific chemicals like PFOA and PFOS.
- Pro: It provides a 100,000-gallon filtration capacity, which covers a large family’s needs for roughly 7 to 11 months.
- Pro: The system includes KDF and granular activated carbon (GAC) media to reduce lead, mercury, and chlorine.
- Con: The 100,000-gallon capacity falls below the 150,000-gallon benchmark for a standard 20-inch cartridge, meaning it may require more frequent replacement in high-use homes.
- Con: The sediment filter only captures particles as small as 5 microns, which may not trap the smallest microscopic contaminants.
Don’t buy this if: you require a filtration system with a lifecycle capacity exceeding 150,000 gallons to ensure a full 12-month service life for a very large household.
Price assessment: The $1310.99 price is a premium investment for a system that includes specialized PFAS and heavy metal reduction media.
Green Writer score: 7.1/10 (data-driven – see “How we picked” above)
If you are looking for a more compact setup, read our full review of the iSpring WGB12B.
Key Specifications for this A Whole House Water Filtration System
| Filtration Capacity | 100,000 gallons |
| Inlet/Outlet Size | 1 inch NPT |
| PFAS Reduction Rate | 99 |
| Filter Media Diameter | 20 inch |
| Filtration Type | PFAS Reduction |
| Certification | SGS-Tested |
| Installation Type | Whole House |
The PFAS Reduction Rate of 99 measures the percentage of specific chemicals removed from the water.
Where this sits in the buyer data: Among the 52 products screened for this category, this one’s 4.7 rating places it #4, on 2,216 ratings – above the 72-rating median of that group, so the average rests on more feedback than most of its comparables. On price it undercuts 2 of them.
Before You Buy: A Whole House Water Filtration System Checklist
The first thing to check is your home’s main plumbing connection size to ensure the 1 inch NPT inlet and outlet ports match your existing pipes.
- ✅ Confirm your plumbing uses 1 inch NPT threads — incorrect threading requires a professional to install adapters or resize the main line.
- ✅ Verify your household’s monthly water usage is under 8,333 gallons — the 100,000 gallon filtration capacity may result in media breakthrough, where exhausted media allows contaminants to pass through, before your 12-month goal is met.
- ✅ Budget for a 12-month maintenance cycle — the filter lasts up to 12 months depending on usage, but high-flow homes may require more frequent media replacement to avoid a drop in filtration quality.
- ✅ Check for 1 inch NPT compatibility — if your current pipes are a different diameter, you will have to return the unit or pay for a plumber to modify the entry point.
You should not buy this product if your household requires a 150,000-gallon service life, as the 100,000-gallon capacity is below that standard lifecycle and may require more frequent maintenance.
What the Numbers Mean in Use
How SGS-tested filtration reduces 99% of PFAS contaminants
The iSpring Whole House Filter reduces up to 99% of PFAS, specifically targeting PFOA and PFOS, which are common industrial and household contaminants. This high reduction rate allows you to treat water for a large family for six months, as the 100,000-gallon capacity covers the 50,000 to 75,000 gallons required for that timeframe. Because the media is SGS-tested, you can rely on a specific laboratory standard for the material’s ability to trap these chemicals.
While many buyers assume PFAS removal requires a complex multi-stage system, this unit handles these specific chemicals within a single whole-house installation. The 99% reduction rate is the specific figure that enables you to address high levels of PFOA and PFOS without needing a separate specialized treatment. The 100,000-gallon capacity means this specific PFAS protection remains available for approximately 7 to 11 months of heavy use before the filter requires replacement.
Multi-Contaminant KDF and GAC Filtration
The iSpring Whole House Filter treats heavy metals like lead and mercury using a combination of KDF and granular activated carbon (GAC) media. This dual-media approach also targets chlorine, radon, and hydrogen sulfide, providing a broader range of protection than standard carbon filters alone. By addressing these heavy metals, the system provides a “do-it-all” solution for household safety that covers more than just aesthetic water improvements.
The GAC media works to reduce odors and tastes, while the KDF media targets the metallic contaminants that often persist in older plumbing. Because the system handles 100,000 gallons of water, you can expect these heavy metal reductions to remain consistent for a family of four for up to 180 to 270 days. This capacity ensures that the media does not reach breakthrough, where exhausted material allows contaminants to pass through the system.
How 5 micron sediment capture protects plumbing and filter media
The FP25B sediment filter captures dirt, rust, and sand as small as 5 microns, which is the size of fine silt and suspended particles. This initial stage protects your plumbing and prevents larger debris from clogging the more specialized PFAS and heavy metal media. By removing these physical particles, the filter ensures that the downstream chemical filtration remains effective for the full 100,000-gallon service life.
A 5-micron rating is a specific threshold that allows you to keep your faucets and showerheads clear of sediment buildup. While this filter does not perform ion exchange softening to remove hardness, it does ensure that the water entering your home is free of the visible particles that can degrade appliances. You should confirm your home’s specific sediment levels before ordering to ensure the 5-micron rating meets your local water conditions.
Which Jobs the iSpring Whole House Filter Handles, Worked Out From Its Specs
The iSpring Whole House Filter against the jobs buyers ask about, worked out from its listed filtration capacity and a typical need for each job.
| Job | What it takes | iSpring Whole House Filter |
|---|---|---|
| Provide clean water for a large household for a year | 100,000 to 150,000 Gallons for 12 months, 85% usable | About 7 to 10 months – short of the 12 months the job takes |
| Treat water for a large family for six months | 50,000 to 75,000 Gallons for 6 months, 90% usable | About 7 to 11 months – enough for the whole 6 months even at the heavier end |
| Filter water for a family of four for one month | 10,000 to 15,000 Gallons for 30 days, 90% usable | About 180 to 270 days – enough for the whole 30 days even at the heavier end |
You can also browse our comparison of the best whole house water filter for heavy metals to see other high-performance options.
For those prioritizing chemical removal, view our comparison of the best whole house water filter for chlorine and odor.
How the iSpring Whole House Filter Compares to Alternatives
The iSpring Whole House Filter provides a 99% PFAS reduction rate, which is the second highest of the models we evaluated that state this specific metric.
- The iSpring WF150K-PF Whole House Water Filter System is $213.74 cheaper than this model.
- The iSpring WF1024 Whole House Water Filter System is $213.74 cheaper than this model.
- The Aquasana Whole House Water Filter System is $314.44 cheaper than this model.
- The AFWFilters Air Injection Iron & Sulfur Whole House Water Filter System is $331.99 cheaper than this model.
- The iSpring Whole House Filter ranks first in buyer ratings among the six systems compared, with a 4.7 average from 2,216 ratings.
- The iSpring Whole House Filter and the Aquasana Whole House Water Filter System match at a 20-inch filter media diameter.
If you need to minimize your upfront costs, the AFWFilters Air Injection Iron & Sulfur Whole House Water Filter System is the more economical choice.
What the deciding spec costs here: Measured as price per unit of Filtration Capacity, the reviewed product works out to $0.01 against a $0.00 median across the 27 other screened products that state the spec, and 27 of them deliver more of it per dollar. The cheapest screened product that beats its 100,000 gallons is the iSpring WGB32B-CPB at $404.98 with 150,000 gallons, which is $906.01 less than this one for more of the spec that decides this category.
Getting the iSpring Whole House Filter Working, and What to Check After
Getting the iSpring Whole House Filter Running
You need a 1 inch NPT plumbing connection to your main water line before the iSpring Whole House Filter can be installed.
- Shut off the main water supply to the house.
- Install the bypass valve to allow water flow while you service the system.
- Thread the 1 inch NPT inlet and outlet into the main line.
- Install the pressure gauge to monitor the pressure drop and determine when filters need replacement.
Warranty and Support: What to Check
Warranty coverage and support terms vary by seller and country.
- Confirm the specific return window and RMA process with your seller before the period ends.
- Verify the connection size of replacement cartridges to ensure they match the 1 inch NPT ports.
- Check that any replacement media matches the 20 inch filter media diameter to ensure a proper fit.
- Verify the pressure gauge readings to confirm the system is operating within expected flow limits.
Test the water flow and check for leaks at every connection point the day it arrives while you are still within the return window.
What Buyers Still Want to Know About This A Whole House Water Filtration System
How long will the filters actually last before I have to spend money to replace them?
Depending on your household’s daily water usage, this capacity allows the filter to last up to 12 months.
What are the specific PFAS reduction capabilities of the iSpring Whole House Filter?
The iSpring Whole House Filter reduces up to 99% of PFAS, specifically targeting PFOA and PFOS. This 99% reduction rate is a primary specification for the FG25B-PF filter media included in this system.
Does this system include filtration for heavy metals and other common contaminants?
Yes, the iSpring Whole House Filter includes the FG25B-KS filter which combines KDF and granular activated carbon (GAC) media. This specific media combination reduces chlorine, lead, mercury, hydrogen sulfide (HS), chloramine, and radon.
What type of sediment filtration is provided for the main line?
The system uses an FP25B sediment filter to capture dirt, rust, sand, and particles as small as 5 microns. This initial stage protects the downstream media from becoming clogged by larger debris.
Is the iSpring Whole House Filter Right for You?
Who the iSpring Whole House Filter suits and the jobs it is the wrong choice for, listed below with the reason for each.
Who the iSpring Whole House Filter is for, and what it does well
Who this a whole house water filtration system suits
- Homeowners in PFAS-contaminated zones — the 99% PFAS reduction rate and SGS-tested media target PFOA and PFOS specifically
- Families with high water usage — the 100,000-gallon filtration capacity supports heavy daily household demand
- Homeowners with well water containing sulfur — the FG25B-KS filter uses KDF and GAC to reduce hydrogen sulfide and chlorine
- Property managers of older buildings — the FG25B-KS filter reduces lead and mercury while the sediment filter captures rust and sand
- Parents concerned about industrial runoff — the specific targeting of PFOA and PFOS provides a safety layer for drinking and bathing water
What this a whole house water filtration system handles well
- Removing chemical runoff from tap water — the 99% PFAS reduction rate
- Eliminating sulfur smells in showers — the KDF and GAC media in the FG25B-KS filter
- Protecting plumbing from sediment buildup — the FP25B sediment filter capturing particles as small as 5 microns
- Providing long-term water filtration — the 100,000-gallon capacity and 12-month lifespan
- Removing heavy metals from household water — the FG25B-KS filter’s ability to reduce lead and mercury
What the iSpring Whole House Filter is the wrong choice for
- High-pressure industrial manufacturing — the 1 inch NPT inlet/outlet size limits flow for heavy industrial machinery
- Ultra-fine micro-filtration — the 5 micron sediment filter limit will not capture microscopic particles smaller than that
- Continuous heavy-duty commercial usage — the 12-month lifespan is limited by specific water conditions and usage rates
What to budget alongside the iSpring Whole House Filter, and what to skip
Accessories worth buying with this a whole house water filtration system
- Plumbing installation kit — required to connect the 1 inch NPT inlet and outlet to the home’s main water line
- Replacement sediment filters — needed to maintain the 5-micron filtration after the initial 12-month period
- Replacement PFAS and KDF/GAC filters — necessary to maintain the 99% reduction rate and chemical filtration after 100,000 gallons
- Water pressure gauge — needed to monitor flow and pressure across the 20-inch filter media diameter
- Bypass valve — required to allow water flow if the system needs maintenance or filter changes
Accessories you can skip buying for this a whole house water filtration system
- Separate lead removal system — the FG25B-KS filter already reduces lead and mercury
- Basic chlorine filter — the FG25B-KS filter already includes GAC media to reduce chlorine
- Small countertop filter — the 100,000-gallon whole house capacity makes point-of-use filters redundant
Where to Buy This A Whole House Water Filtration System
The iSpring Whole House Filter sat at $1310.99 in the listing data from November 2026; the price you see at checkout can differ.
Whole house water filtration systems are sold by the retailers below – we do not track which of them has the iSpring Whole House Filter in stock, so check availability and the current price with the retailer before making a trip.
- Build.com (online only) — specialized plumbing and home improvement selection
- WaterFilterStore (online only) — specialist retailer with technical expertise and filtration systems
- Walmart (online and physical stores) — accessible pricing and convenient in-store availability
- Amazon (online only) — extensive selection of brands and competitive pricing
- Home Depot (online and physical stores) — physical locations for viewing and trade professional accounts
- Lowe’s (online and physical stores) — wide variety of plumbing fixtures and in-store pickup
Final Verdict on the iSpring Whole House Filter
If you need to treat water for a large family for six months, the iSpring Whole House Filter provides enough capacity for that duration. The 100,000-gallon filtration capacity allows for roughly 7 to 11 months of use at a heavy consumption rate of 75,000 gallons every six months.
You should choose the iSpring Whole House Filter if you require a system that specifically targets PFAS, including PFOA and PFOS. The FC25B-PF filter uses SGS-tested media to reduce up to 99% of these chemicals. For broader water quality, the FG25B-KS filter combines KDF and granular activated carbon (GAC) media—materials that trap contaminants like chlorine, lead, and mercury—while the FP25B sediment filter captures particles as small as 5 microns.
The iSpring Whole House Filter is the right choice if you need a whole house filtration system to target PFAS and heavy metals for a medium-to-large household. You can purchase this system for around $1,310.99.
The 4.7 rating from 2216 buyer ratings provides a significant signal of user experience for this high-capacity system.
Skip it if: You need a system that can provide clean water for a large household for a full 12 months, as the 100,000-gallon capacity falls short of the 150,000-gallon requirement for that timeframe.
Browse our other whole house water filtration pages
- The Whole House Water Filters That Work Best for Hard Water Scale
- Which Whole House Water Filter Is Best for Iron and Manganese?
- Best Whole House Water Filters for Sediment and Rust
- Whole House Water Filters for Chlorine and Odor Compared
- Choosing the Best Whole House Water Filter for Large Families
- Removing Well Water Smell With a Whole House Water Filter