REASONS TO BUY
Excellent contamination removal
NSF certified
Longer filter life
REASONS TO AVOID
Takes up a lot of under-sink space
Wastes water
Filter changes aren't as easy as other systems
Doesn't remove as much PFNA as some other RO units
iSpring RCC7AK Review
The iSpring RCC7AK is a high-performing RO system that removes a wide range of contaminants while its remineralization stage improves both taste and pH balance
Credit: Matt Lighthart
By Sam Hill ⋅ Review Editor ⋅ December 5, 2025
Our Verdict
The iSpring RCC7AK is a robust reverse‑osmosis system that delivers high-purity water with a 6‑stage filtration process, including an alkaline remineralization stage that improves taste and balances pH. It removes most of common contaminants like lead, fluoride, PFNA, and heavy metals at high levels, producing cleaner water that many users prefer to bottled water. The transparent first-stage housing and color-coded tubing simplify DIY installation, though it occupies significant under-sink space and generates some wastewater. This is definitely a project rather than a one-step fix. This filter is ideal for those who want really thorough purification with better taste, but not for buyers with limited space or who don't want to deal with the complexities of a full installation.
Our Analysis and Test Results
What sets this RO system apart is its combination of thorough filtration and relative affordability. The iSpring RCC7AK includes a 6-stage process with a dedicated alkaline remineralization filter, built from FDA-approved, food-grade materials, and constructed for durability. This removes nearly all critical contaminants that we tested for, as well as most common heavy metals.
The big issue here is its size. Reverse osmosis systems sound great until you try to install one. While installation requires effort, the system's long-term filter costs are reasonable, making it a strong choice for households seeking high-quality purification at an affordable price.
Credit: Matt Lighthart
Contaminant Removal
The iSpring RCC7AK excels at removing the most concerning contaminants. In testing, it removed 100% of lead, arsenic, and uranium, and showed fluoride reduction at around 97–99%.
PFAS Testing Results
| iSpring RCC7AK RO | |
|---|---|
| Test | Cyclopure WTK PFAS |
| Total Reduction | 91% |
| Total PFAS (ppt) | 2.6 |
| PFNA Reduction | 90% |
| PFNA (ppt) | 2.6 |
| PFBA Reduction | 100% |
| PFBA (ppt) | 0 |
PFNA reduction is not as effective as that of some competitors, but it is still significant, with our tests showing approximately a 90% removal. Our tester wrote, “If PFNA was a main concern, I would look at ones that removed it to below detectable levels, but there shouldn't really be any in your drinking water.” This RO system might be a bit overkill for standard city water, but it could be a lifesaver if you have specific concerns about your water supply affecting your health.
Credit: Matt Lighthart
Heavy Metal and Trace Element Removal
This system performs strongly against a broad spectrum of heavy metals: copper, barium, vanadium, lithium, and molybdenum were reduced to near-zero. Some trace elements may slightly increase due to the alkaline filter (like aluminum, strontium, and vanadium under highly acidic water), but levels remain safe.
Metals and Trace Elements and % Removal
| iSpring RCC7AK RO | |
|---|---|
| Test | Tap Score Essential City Water Test |
| Barium Removed | 100% |
| Barium (ppm) | 0 |
| Copper (Extreme) Removed | 100% |
| Copper Extreme (ppm) | 0 |
| Copper (Normal) Removed | - |
| Copper Normal (ppm) | - |
| Vanadium Removed | - |
| Vanadium - Tap Water (ppm) | - |
| Iron Removed | 100% |
| Iron (ppm) | 0 |
| Strontium Removed | - |
| Strontium (ppm) | - |
| Zinc Removed | 100% |
| Zinc (ppm) | 0 |
Taste
The added alkaline filter enhances the water taste, producing a naturally balanced pH level. Most users prefer this water over bottled alternatives. Some initial flushing may be required to remove a slight plastic or first-use taste, but quality gets up to speed in no time.
Taste is subjective, of course, but the vast majority of online reviews that mention taste are positive when it comes to this RO system.
Credit: Matt Lighthart
Maintenance and Setup
Installation is more involved than pitcher or countertop units, requiring under-sink space and some plumbing work. Depending on how handy you are, you may need to contract a professional to get your system installed properly.
Changing filters is also more complex, though color-coded tubing and clear housing help determine when you need to get replacement filters.
Credit: Matt Lighthart
Before purchasing and attempting installation, make sure you have enough under-sink space for this system — it measures 15.5"L × 5.1"W × 19"H and weighs 25 lbs, so it's fairly sizable compared with standard RO units.
Operating Cost
Replacement filters are reasonably priced relative to other RO systems: pre-filters last 6–12 months, the membrane 1–3 years, and the alkaline filter 6–12 months. First-year filter costs are around $95, with realistic long-term filter costs of $340–$488 over 5 years, depending on usage.
Credit: Matt Lighthart
Should You Buy the iSpring RCC7AK?
The iSpring RCC7AK is best suited for homeowners who want thorough water purification and have the space and budget for an RO system. It's ideal if you have the space, patience, and confidence for DIY installation and don't mind generating some wastewater in exchange for cleaner, better-tasting water. Avoid this system if under-sink space is tight, you prefer a simpler setup, or you need a quick, plug-and-play solution. Its combination of filtration quality and reasonable long-term costs makes it a strong option for those willing to invest the effort upfront.
Credit: Matt Lighthart
What Other Water Filters Should You Consider?
If you want a reverse-osmosis system, the APEC ROES-50 Essence Series is a strong alternative. It's our Top Pick for RO Systems, has the best filtration scores across contaminants, and is a bit cheaper upfront. Long-term costs are a bit higher, but you'll get serious benefits for the uptick. Or, if the details of an RO system have scared you off, consider the Pur Plus 11-Cup Pitcher, our Editor's Choice pick for the best overall water filter and our favorite pitcher. You'll have to fill up this pitcher regularly, so it's a bit less convenient day-to-day, but it provides nearly RO-quality filtration for a fraction of the price.
Side-by-Side Comparison
Compare iSpring RCC7AK versus top competing products:
—Sam Hill
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