NSF Certified, Alkaline vs. RO vs. Compared RO: 75 GPD Surprising Home Use... Easy Install We were impressed by how seamlessly the iSpring RCC7AK integrates into our daily routine. Its NSF certification and 75 GPD output provide peace of mind, while the alkaline remineralization process elevates our water to a refreshing pH balance. The top-mounted faucet design simplifies installation—no complicated under-sink fuss. Our water tastes noticeably cleaner than tap, and the stylish design blends effortlessly with kitchen aesthetics. The 6-stage filtration effectively removes impurities, though we appreciate the added mineralization for a more pleasant mouthfeel. With its reliable performance and user-friendly setup, it’s clear why homeowners love this system. We wouldn’t hesitate to recommend it for anyone seeking a high-quality, easy-to-use solution.