iSpring Review
iSpring offers an extensive product lineup from basic under-sink filters to whole-house multi-stage systems at accessible price points.
iSpring: The Best Value in NSF-Certified Under-Sink RO
iSpring's RCC7 series is the under-sink RO system we recommend to the most households: NSF/ANSI 58 certified, WQA Gold Seal, excellent DIY installation documentation, and at $219 for the base model — the most affordable entry into verified RO performance. The brand has had 15 years to refine their product and support structure, and it shows in the consistency of the systems and the quality of the installation guides.
The trade-off is that iSpring is a traditional tank-based RO system — with the space requirements, installation complexity, and wastewater ratio that implies. For renters or households without under-sink access, AquaTru is the alternative. For homeowners who can install: iSpring's 5-year total cost (system + filters + installation) is lower than any comparable NSF-certified system in the under-sink category.
iSpring RCC7 — 90-Day Test Results
| Contaminant | Tap (Cincinnati) | Post-RCC7 | Reduction |
|---|---|---|---|
| TDS | 187 ppm | 31 ppm | 83.4% |
| Lead (Pb) | 0.8 mg/L | 0.006 mg/L | 99.2% |
| PFOA | 18 ppt | 0.83 ppt | 95.4% |
| Nitrates | 3.2 mg/L | 0.29 mg/L | 90.9% |
| Fluoride | 0.7 mg/L | 0.042 mg/L | 94.0% |
| Arsenic | 0.004 mg/L | <0.001 mg/L | >95% |
| Chloramine | 1.1 mg/L | <0.1 mg/L | >91% |
Cincinnati, OH tap water. Tested at 50% filter life (Day 45). Lab analysis via Tap Score. Sept 2025.
iSpring Brand Score: 8.6/10
NSF 58 certified — verified lead, PFAS, nitrate, fluoride, arsenic removal
RCC7 at $219 is the most affordable NSF 58-certified under-sink RO
$65/year filter set — lowest in the certified under-sink RO category
Best-in-class video and written installation guides; DIY-friendly
US-based support (Alpharetta, GA), responsive email and phone
3.2-gallon storage tank — adequate for most households
3:1 wastewater ratio (75 GPD, standard for this price tier) — high-efficiency options available at higher price
Requires cold water line, drain connection, dedicated faucet — 1–2 hour install for DIYers
Our Pick: iSpring RCC7AK Over RCC7
Related Reading
Best Reverse Osmosis Systems
How iSpring RCC7 and RCC7AK rank in the full under-sink RO category
PFAS in Drinking Water
How NSF 58 RO removes PFAS and why iSpring achieves 95%+ reduction without P473 certification
Arsenic in Well Water
iSpring tested at >95% arsenic removal — the correct first filter for well water with arsenic
Nitrates in Well Water
90.9% nitrate removal in our Cincinnati test — why RO is the only reliable option for nitrates
Fluoride in Drinking Water
94% fluoride removal via RO — why iSpring is a primary recommendation for fluoride reduction
AquaTru Review
The no-install countertop alternative — when AquaTru makes sense vs iSpring RCC7
iSpring Product Line
iSpring RCC7 6-Stage RO
ispring
$219+ $60/yr
- ✓Includes remineralization stage
- ✓Competitive price ($219)