1 / 7iSpring WGB31B-MKS Whole House Iron and Manganese Filter
The iSpring WGB31B-MKS is a three-stage whole-house filter system listed for reducing iron, manganese, sediment, and several other contaminants. Its iron and manganese reduction claims have stated upper limits, so compare them with your water test results before choosing it.
At a glance
- Three filter stages target sediment, iron and manganese, and contaminants including chlorine, lead, mercury, and hydrogen sulfide, according to the listing.
- The listed iron and manganese reduction claims are capped at 3.0 ppm and 1.0 ppm respectively.
- Manufacturer claims capacity up to 50,000 gallons or 12 months, with a maximum flow rate of 15 gpm.
- The system uses 1-inch female NPT connections and standard 10" x 4.5" cartridges, per the product details.
Reference price: $319.99
Price checked: Nov 14, 2026
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Pros and cons
Pros
- Combines sediment filtration with stated iron and manganese reduction and a second-stage GAC and KDF filter.
- The stated 15 gpm maximum flow and whole-house installation are suited to treating a home's incoming water supply.
- The manufacturer lists a 12-month or 50,000-gallon service interval, whichever applies first.
Cons
- The stated iron and manganese reduction ranges may not suit water concentrations above 3.0 ppm iron or 1.0 ppm manganese.
Technical specifications
18 specifications| Brand | iSpring |
|---|---|
| Model | WGB31B-MKS |
| Installation type | Whole House |
| Power configuration | Water Pressure |
| Filtration method | Activated Carbon, Carbon Block |
| Special features | Heavy Duty, Removes Iron |
| Maximum flow rate | 15 gpm |
|---|---|
| Capacity | 50000 gallons |
| Filter life cycle | 12 months |
| Iron reduction claim | up to 3.0 ppm |
| Manganese reduction claim | up to 1.0 ppm |
| Dimensions listed | 24.5"L x 10.8"W x 18"H |
|---|---|
| Weight listed | 27.5 pounds |
| Inlet/outlet | 1 inch Female NPT |
| Installation pressure range | Minimum Working Pressure 25 psi Maximum Working Pressure 80 psi |
| Operating temperature | 40-100 ºF |
| pH range | 6 - 9 |
| Material | Carbon |
|---|
What to know before buying
Listing details to confirm
The listing describes reduction of iron up to 3.0 ppm and manganese up to 1.0 ppm. If testing shows higher concentrations, the manufacturer points to a different system. It also says the filter does not reduce TDS. The stated service life is up to 12 months or 50,000 gallons, and outdoor installation requires protection from weather and freezing.
What’s in the box
Included- System
- Filters
- Wrench
- Manual
Who is it for?
A good fit for
- Households looking for whole-house filtration with stated reduction targets for iron and manganese within the listed limits.
- Buyers who want sediment, chlorine, and selected heavy-metal reduction in a pressure-driven, three-stage system.
- Homes where the incoming water supply and plumbing can accommodate the listed 1-inch female NPT connections.
Less suited to
- Water with iron above 3.0 ppm or manganese above 1.0 ppm, based on the manufacturer’s stated limits.
- Buyers seeking TDS reduction from this filter system.
Customer reviews on Amazon
- 5 stars
85% 85% - 4 stars
7% 7% - 3 stars
4% 4% - 2 stars
1% 1% - 1 star
3% 3%
Customer feedback reports clearer-looking water, less visible red staining in tubs and toilets, easier installation, and improved taste. Those reports are relevant to buyers focused on iron-related staining and household water quality, but they do not establish results for every water supply. Feedback is positive overall, while the rating distribution also includes lower-star ratings, so results and installation experiences may vary.
Positive themes
- Customers report clearer-looking water and less red staining in tubs and toilets.
- Feedback mentions easier installation and improved water taste.
Frequently asked questions
What iron and manganese levels does the listing say this system targets?
The manufacturer states iron reduction up to 3.0 ppm and manganese reduction up to 1.0 ppm. Compare those limits with a water test before buying.
Does this system reduce total dissolved solids?
No. The listing says it retains healthy minerals and does not reduce TDS.
How often do the filters need replacement?
The listing states a filter life of up to 12 months or 50,000 gallons. Actual replacement timing will depend on use and water conditions.
What are the connection and operating requirements?
The listed connection is 1 inch Female NPT, with a minimum working pressure of 25 psi and maximum of 80 psi. The listed pH range is 6 - 9.
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