6 Stage NSF Certified Under Sink Reverse Osmosis Drinking Water Filter System w/ Brushed Nickel Faucet

The iSpring RCC7AK is a 6-stage under sink reverse osmosis system certified to NSF/ANSI 58 standards that removes up to 99% of over 1,000 contaminants from your drinking water. This system uses a 75-gallon-per-day RO membrane to filter out lead, chlorine, fluoride, arsenic, asbestos, calcium, sodium, and hundreds of other dissolved solids, then adds a sixth stage alkaline remineralization filter to restore healthy minerals and balanced pH. Unlike standard 5-stage systems that produce slightly acidic water with a pH of 7.0 or below, the RCC7AK's alkaline filter brings water back to a balanced pH for better taste and mineral content. Designed for residential under-sink installation, it fits beneath a standard kitchen sink and includes everything needed for DIY setup, typically completed in a couple of hours.

• NSF/ANSI 58 Certification for TDS Reduction: This system meets strict NSF 58 standards for reverse osmosis performance, verifying its ability to reduce total dissolved solids. You get documented contaminant removal backed by independent third-party testing.

• 6-Stage Filtration with Alkaline Remineralization: The first five stages remove contaminants through sediment, carbon, and reverse osmosis filtration, while the sixth stage alkaline filter restores healthy minerals like calcium and magnesium to produce balanced alkalinity. Standard RO systems strip minerals and produce acidic water; this system puts beneficial minerals back in for improved taste and pH balance.

• 75 GPD Reverse Osmosis Membrane: The multilayer RO membrane processes up to 75 gallons per day, providing ample filtered water for drinking, cooking, and beverage preparation. This flow rate supports typical household needs without long wait times to refill containers.

• Clear First-Stage Housing: The transparent housing on the first sediment filter lets you visually inspect filter condition at a glance. You can see when sediment accumulation requires a filter change instead of guessing based on time alone.

• Quick-Connect Push-Fit Tubing: All tubing connections use push-to-connect fittings that lock with a simple half-inch push and clip. Installation requires no threading, soldering, or specialized plumbing skills, and disassembly for filter changes is just as straightforward.

• Lead-Free Brushed Nickel Faucet: The included solid brass faucet has a brushed nickel finish and meets lead-free standards for drinking water contact. It mounts on your countertop as a dedicated filtered water tap, keeping your main faucet free for regular sink use.

• Pressure Tank with Built-In Storage: The system includes a pressurized storage tank that holds filtered water for immediate dispensing. When you open the faucet, stored water flows out instantly rather than waiting for the RO membrane to process each glass.

• Extra Parts Included: Multiple spare components ship with the system to support installation variations and future maintenance. These extras help ensure you can complete setup regardless of your specific under-sink configuration.

This system requires incoming water pressure between 45 PSI and 70 PSI and operates in water temperatures from 40°F to 100°F. Maximum total dissolved solids (TDS) in the source water should not exceed 750 ppm. Install the system in a location protected from freezing temperatures, extreme heat, and direct sunlight. The RO membrane and filters are designed to handle municipal tap water; well water or other sources with high sediment, hardness, or bacterial content may require pretreatment or more frequent filter changes.

Installation is designed for DIY completion using the included instructions, online videos, and phone support from iSpring's Atlanta-based technical team. The system mounts under a standard kitchen sink with all necessary parts provided except Teflon tape for threaded connections. A hole must be drilled through the countertop or sink deck to mount the faucet (check clearance for sink clips below the mounting point). The drain line connects via a saddle valve or direct fitting to your sink's drainpipe. After installation, flush the system according to the included startup procedure to remove any manufacturing residue and activate the filters. Replace the sediment and carbon pre-filters every 6 to 12 months, the RO membrane every 2 to 3 years, and the alkaline filter annually, based on water quality and usage.

• 3 pre-filter housings with sediment and carbon filters installed
• 75 GPD reverse osmosis membrane
• Post-carbon filter
• Alkaline remineralization filter
• Pressurized storage tank with tank valve
• Lead-free solid brass faucet with brushed nickel finish
• Feed water adapter and valve
• Drain saddle valve
• Quick-connect tubing and fittings
• Mounting hardware and clips
• Installation manual with step-by-step instructions
• Extra O-rings, clips, and spare parts

The iSpring RCC7AK is backed by a 1-year manufacturer warranty and lifetime technical support provided by iSpring's US-based team in Atlanta, Georgia. The company also offers a 1-year money-back guarantee on the system.

A: Replace the first-stage sediment filter, second-stage GAC filter, and third-stage CTO carbon block filter every 6 to 12 months depending on your water quality and household usage. The reverse osmosis membrane should be replaced every 2 to 3 years. The sixth-stage alkaline remineralization filter requires annual replacement. iSpring offers complete filter replacement kits (F9K for 1 year of filters, F19K75 for 2 years) with all cartridges needed for scheduled maintenance.

A: The system is certified to NSF/ANSI 58 standards and removes up to 99% of over 1,000 contaminants including lead, chlorine, fluoride, arsenic, asbestos, calcium, sodium, and other dissolved solids. The multi-stage filtration process targets heavy metals, chemicals, sediment, and taste and odor compounds. It reduces total dissolved solids (TDS) to produce purified drinking water.