iSpring WGB31B-KS 3-Stage Whole House Water Filter

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Product guide

iSpring WGB31B-KS 3-Stage Whole House Water Filter

The iSpring WGB31B-KS is a three-stage whole-house water filter intended to reduce sediment, chlorine, and selected contaminants such as lead and mercury. Its listed flow rate and capacity suit buyers seeking filtration for a home’s water supply, but it does not reduce water hardness or total dissolved solids.

At a glance

Three filtration stages are described as a sediment filter, a GAC+KDF compound filter, and a carbon block filter.
The listing claims reduction of chlorine, lead, mercury, sediment, hydrogen sulfide, and other substances. Results depend on water conditions and are not independently verified here.
A stated maximum flow rate of 15 gpm and capacity of 50,000 gallons are presented by the listing.
Standard 10" x 4.5" cartridges and 1" NPT connections are specified in the product details.
The listing says the system retains minerals and does not reduce TDS.

Price

$255.49Save 17%

Reference price: ~~$305.99~~

Price checked: Nov 12, 2026

View offer Ahead of Black FridayExplore the selection

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Pros and cons

Pros

Three stages combine sediment filtration with GAC+KDF and carbon block media.
The listed capacity and maximum flow rate are useful reference points for sizing a whole-house system.
The listing describes pressure-release buttons to assist with cartridge changes.
Standard-size cartridges and a detailed manual are described, which may help with installation and future replacement.

Cons

It does not reduce water hardness or total dissolved solids, so it is not a water softener or a dissolved-solids treatment system.

Technical specifications

12 specifications

Identity
Brand	iSpring
Model	WGB31B-KS

Filtration and performance
Purification method	Activated Carbon, Carbon Block
Maximum flow rate	15 gpm
Capacity	50000 gallons

Power and configuration
Power configuration	Water Pressure

Dimensions and installation
Dimensions listed	24.5"L x 8"W x 18"H
Weight listed	27.2 pounds
Installation type	Wall Mount

Materials
Material listed	Plastic, PP (Polypropylene), PE (Polyethylene), Steel

Other listed details
Special feature	Heavy Duty
Included components	System, Filters, Wrench, Manual

What to know before buying

The manufacturer says the system does not reduce hardness and recommends considering a softener for hard water. It also advises indoor installation in a ventilated, protected area. Outdoor installation requires protection against frost, sun, and water exposure. Follow the listed operating range of 25–80 psi and 40–100 ºF.

What’s in the box

Included

System
Filters
Wrench
Manual

Who is it for?

A good fit for

Households seeking whole-house sediment, chlorine, taste, and odor filtration with listed reduction claims for selected contaminants.
Buyers able to accommodate a wall-mounted unit and who want a stated maximum flow rate of 15 gpm.
People comfortable checking water conditions and selecting a separate softener or other treatment if hardness or dissolved solids are concerns.

Less suited to

Buyers who need water softening or reduction of total dissolved solids from this filter alone.
Anyone needing confirmed contaminant-removal performance for a specific water supply without first checking applicable testing and water-analysis details.

iSpring WGB31B-KS 3-Stage Whole House Water Filter · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 61 ratings

5 stars84%84%
4 stars7%7%
3 stars5%5%
2 stars1%1%
1 star3%3%

Customer feedback describes clearer-looking water, easier installation, improved taste, and fewer red stains in tubs and toilets. Those reported experiences are relevant to households focused on visible sediment or taste and odor, but they do not establish contaminant-removal performance for a particular water supply. The overall rating distribution is mostly five-star, with a smaller spread of lower ratings, so experiences are not uniform.

Positive themes

Customers report improved water clarity and taste.
Customers describe installation as easy.
One customer reports fewer red stains in toilets and tubs.

Frequently asked questions

Does the WGB31B-KS soften water?

No. The listing says it does not reduce hardness. A separate water softener may be needed for hard water.

Does this system reduce TDS?

No. The listing says it retains minerals and does not reduce total dissolved solids.

What is the stated flow rate and capacity?

The listing gives a maximum flow rate of 15 gpm and a capacity of 50000 gallons. These are manufacturer-stated figures, not independently verified results.

What installation details should I check?

The listed installation type is wall mount. Product details also specify 1 inch Female NPT inlet and outlet connections and an operating pressure range of 25–80 psi.