
iSpring WGB21B
Score: 72/100
A. O. Smith Single-Stage
Score: 78/100Rankings

The AO Smith Single-Stage Whole House Water Filter is a low-maintenance, activated carbon system designed to reduce chlorine taste and odor with a 6-year filter life. It does not remove sediment, bacteria, or PFAS, making it unsuitable for well water with high sediment. It is best suited for households of 4 or more with city water supplies seeking to improve chlorine taste and odor.

The iSpring WGB21B is a compact 2-stage whole house water filtration system designed to remove sediment, chlorine, and other contaminants from the entire home's water supply. It combines a 5-micron polypropylene sediment pre-filter with a coconut shell carbon block filter to deliver clean water at a high flow rate of up to 15 GPM. It is best suited for apartment dwellers and renters in smaller living spaces needing effective whole-house filtration.
| Attribute | ![]() | ![]() |
|---|---|---|
15 GPMbest | 7 GPM | |
12 months | 72 monthsbest | |
2 stagesbest | 1 stages | |
— | 0 %best | |
| ↓ lower better | 5 micronsbest | — |
1 years | 6 yearsbest | |
| ↓ lower better | 11 inches | 7.64 inchesbest |
| ↓ lower better | 19 inches | 7.76 inchesbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Health & Safety(1) | ||
Certifications | null | None |
Filtration & Performance(5) | ||
Filtration Technology | 2-Stage | Granular Activated Carbon |
Flow Rate (GPM) | 15 GPM | 7 GPM |
Filtration Stages (stages) | 2 stages | 1 stages |
TDS Reduction (%) | false % | 0 % |
Micron Rating (microns) | 5 microns | N/A microns |
Maintenance & Warranty(2) | ||
Filter Lifespan (months) | 12 months | 72 months |
Warranty (years) | 1 years | 6 years |
Dimensions & Build(3) | ||
Height (inches) | 11.0 inches | 7.64 inches |
Width (inches) | 19.0 inches | 7.76 inches |
Depth (inches) | 26.0 inches | 14.96 inches |

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Professional reviewers describe the AO-WH-FILTER as obsessively engineered for clean water, highlighting its effectiveness in removing chlorine taste and odor. Experts note it is suitable for households of four or more with city water, improving skin and hair softness.
There is no specific consumer feedback or ratings available in the source data. The product is marketed as perfect for households of four or more, offering benefits for various household water uses like drinking and bathing.