iSpring RCC7 - Best Overall Under-Sink Filtration
A top-performing under-sink reverse osmosis system that delivers exceptional contaminant removal and great-tasting water, making it ideal for households seeking comprehensive filtration.
- +Removes 100% of tested contaminants including lead, chlorine, and fluoride
- +Relatively low annual operating cost of approximately $50
- +Five-stage reverse osmosis process with NSF certified filters
- -Requires professional or advanced DIY installation under the sink
- -Produces wastewater with a 2:1 pure-to-waste ratio
- -Removes beneficial minerals, resulting in a neutral but demineralized taste
The iSpring RCC7 stands out as a premier under-sink reverse osmosis system, delivering unmatched performance in contaminant removal. Independent laboratory testing confirmed its ability to eliminate 100% of numerous harmful substances, including lead, chlorine, fluoride, and copper, while also reducing over 99% of sulfate and iron. This five-stage filtration process, which incorporates both sediment and carbon pre-filters before the semi-permeable RO membrane, ensures water is thoroughly purified. The resulting water is consistently described as neutral, crisp, and odorless.
While the initial setup requires plumbing modifications and the system does produce wastewater, its long-term value is excellent. The annual filter replacement cost is competitive, and the system's reliability makes it a cornerstone for home water safety. It is particularly well-suited for families or individuals with specific concerns about municipal water quality, providing peace of mind through its certified performance.