iSpring RCC7AK-BN 6-Stage Reverse Osmosis System
iSpring
Not certified for nitrate — the NSF/ANSI 58 listing names nine other contaminants
The iSpring RCC7AK-BN is a 6-stage under-sink reverse osmosis system and the most-reviewed pick on this page (21,508 ratings at 4.6 stars). Read its listing before its marketing: NSF/ANSI 58, active, covers asbestos, barium, cadmium, trivalent chromium, copper, fluoride, lead, selenium and total dissolved solids — nine claims, and nitrate is not among them. NSF/ANSI 58 is the standard under which nitrate reduction CAN be certified; iSpring has not certified this model for it. An RO membrane is the right mechanism for the small, soluble nitrate ion that carbon passes straight through, but nobody has tested and listed it, so we do not print it as verified. What this unit is genuinely good for is the rest of that list — lead and fluoride certified on the same record — plus an alkaline stage that fixes the flat taste of plain RO water. If nitrate is your actual concern, buy the Aquasana SmartFlow AQ-SFRO2, the one pick here whose listing names nitrate.
Key Features
- NSF/ANSI 58 listing carries nine claims — lead and fluoride included, but not the contaminant this page is about
- 6 stages including carbon adsorption and a post-RO alkaline remineralizer
- 75 GPD membrane — enough output for a family kitchen
- Largest review base on this page (21,508 ratings at 4.6 stars)
Our Review
This is the most-reviewed system on the page and the cheapest to run, and neither of those is a nitrate certification. Its NSF/ANSI 58 record lists asbestos, barium, cadmium, trivalent chromium, copper, fluoride, lead, selenium and total dissolved solids. NSF/ANSI 58 is the standard under which nitrate reduction CAN be certified; iSpring has not certified this model for it. Holding a standard is not the same as carrying a claim, and this page exists to make exactly that distinction. An RO membrane is the right mechanism for the small, soluble nitrate ion that carbon passes straight through — but likely is not listed, and we do not print a mechanism as a certificate. What you can rely on is the nine claims above, an alkaline post-filter that fixes RO's bland mouthfeel, and the lowest running cost here. The trade-off is the install: a storage tank takes cabinet space and refills slowly after a big draw. For a listed nitrate claim, buy the Aquasana SmartFlow AQ-SFRO2, the one pick here whose listing names nitrate.
Pros
- +Nine certified claims on one NSF/ANSI 58 record, lead and fluoride among them
- +Broad dissolved-solids reduction from a 6-stage membrane system
- +Remineralization stage puts calcium and magnesium back after the membrane
- +Low annual filter cost keeps long-run ownership cheap
Cons
- -No listed nitrate claim — reduction here is by mechanism, not by certificate
- -Self-install with a storage tank — needs under-sink cabinet space and ~1 hour of plumbing
- -Tank-based RO is slower to refill than a tankless system after heavy draws
- -Sediment/carbon pre-filters need replacing every 6–12 months to hold certified performance
Specifications
Stages
6-stage
Filter Life
12 months
Annual Filter Cost
$60/year
Warranty
1 year
