The iSpring RCC7AK is a heavy-duty filtration system built to tackle seriously dirty water. Its filters hide under your sink, quietly removing contaminants down to an incredibly tiny size of 0.0001 microns. Then it puts the good stuff — calcium and magnesium — back in for a full, rich, crisp taste. Once it's finished, the water waits in a sizeable 3.2-gallon storage tank, ready to use anytime you turn on the dedicated faucet.
Metals stand no chance against the iSpring. In our tests, it removed 100% of lead, arsenic, uranium, lithium, and more, making it a standout in this metric.
Heavy metals can enter our water naturally or be elevated by aging pipes or nearby industrial activity. When too high, they can cause permanent health damage or unpleasant tastes, odors, and staining. Luckily, the iSpring acts as a brick wall against them all. It's also certified to remove cadmium, chromium, copper, and lead.
PFAS reduction is not as effective as some competitors', but it's still significant.
In our tests, the iSpring removed around 90-100% of PFNA and PFBA, two common PFAS chemicals, which is a great start. However, as our tester wrote, “If you're concerned about the health effects of these widespread forever chemicals, I'd look for a system that removes them to below detectable levels.” Every other RO system in our lineup removed 100% of these chemicals that we spiked into our water, as did a few pitcher models.
Able to nab 100% of microplastics, the iSpring provides total protection against these ubiquitous particles. Given that most households contain some amount of these contaminants, finding a water filter that prevents microplastics from entering our cup is a much-welcomed layer of protection.
Like most RO systems we tested, the iSpring RCC7ACK did an outstanding job of removing notoriously difficult contaminants like fluoride, nitrate, and sulfate.
The slow, methodical drip through the fine RO filter ensures 99% of larger fluoride and sulfate ions are captured, while a tiny percentage of smaller nitrate ions may slip through the cracks. Still, a 95% nitrate removal is better than most pitcher and faucet filters can provide, and a great perk for users who live near farmland. Plus, the iSpring holds a fluoride-removal certification if you have concerns about this municipally added contaminant.
The iSpring scored above average in our taste tests. Thanks to its specialized AK filter, the iSpring adds essential minerals back into your filtered water. These minerals not only enhance taste but also help maintain a balanced pH level. Most users report enjoying the flavor, with one touting, “It's superb! And delicious! My water has no chlorine taste or smell.” There are a few sporadic reports of it not improving taste or imparting an odd flavor, but the overwhelming majority of Amazon reviewers report a positive experience.
The iSpring RCC7AK is one of our favorite water filters for day-to-day use. It runs quietly in the background, ensuring its large 3.2-gallon tank is always ready with fresh, filtered water anytime you need it. Using the dedicated RO faucet certainly beats refilling a pitcher every day.
The iSpring is also quite affordable to maintain, especially for users with high water needs. Even for a busy family of four, replacement filters only cost about $100 a year, which is far less than most pitchers. It generates about 2.5 gallons of wastewater per 1 gallon of clean water, though, which may increase your monthly water bill.
On the downside, the iSpring requires a pretty involved setup. It takes up a ton of space under the sink and may even require drilling a hole into your countertop for the dedicated faucet, so many homeowners opt to hire a professional. Filter changes are infrequent, but with six filters and a bulky wrench, they're a pain in the butt when it is time.
| iSpring RCC7AK RO | |
|---|---|
| Setup Time | Long |
| Setup Effort | High |
| Maintenance Effort | High |
| Maintenance Frequency | 6 months - 3 years depending on filter component |
| Overall Rating |
Most users won't ever run out of water, but if you happen to drain the large tank, expect a long wait. The iSpring filters water slower than most, but such is the price to pay for powerful filtration.
The iSpring RCC7AK is best suited for homeowners who want thorough water purification and have the space, time, and budget to care for an RO system. What sets this system apart from other RO systems is its special remineralization filter, which adds beneficial, great-tasting minerals back into your clean water stock. If you have ample undersink space, have the patience for involved filter changes, and don't mind generating some wastewater, we think the iSpring is a great choice for safer, better-tasting water. However, if space is tight or you need a quick, plug-and-play solution, an RO system may be more of a headache.
| Awards | |
|---|---|
| Price | $242 List Check Price at Amazon |
Overall Score  |
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| Star Rating | |
| Bottom Line | High-quality, reverse-osmosis-grade filtration with a natural spring-like taste, but expect a complicated install |
| Pros | Excellent contaminant removal, remineralizes water for natural spring taste, affordable for high water users, long filter life |
| Cons | Time- and space-consuming install, filter changes are a hassle, wastes water, slightly less PFAS removal than other RO systems |
| Rating Categories | iSpring RCC7AK |
| Lead & Metals (25%) | |
| Forever Chemicals (PFAS) (20%) | |
| Microplastics (15%) | |
| Fluoride & Nitrates (15%) | |
| Taste & Chlorine (15%) | |
| Daily Use & Upkeep Cost (10%) | |
| Specifications | iSpring RCC7AK |
| Filter Type | Under Sink Reverse Osmosis |
| Installation Difficulty | High |
| Estimated cost per year (40 gal/month) | $95 |
| Estimated cost per year (160 gal/month) | $95 |
| Wastewater Generated | 2:1 ratio wastewater-to-filtered |
| Filter Replacement Schedule | Stages 1, 2, 3: 6-12 months Stage 4: 1-3 years Stage 5: 12 months Stage 6: 6-12 months |
| Filter Replacement Cost | Single Filters - $19-$38 1 year supply complete set - $80 |
| Certifications | NSF/ANSI 58 |
