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Simpler and more compact than Reverse Osmosis systems, the CU-A4 is an excellent choice for most general water filtration applications. The advanced 4-stage design of the CU-A4, featuring a unique combination of Activated Carbon, Ultra Filtration and KDF filters, removes a wide variety of unhealthy contaminants, including lead, arsenic, iron, nickel, chromium, cadmium, calcium, aluminum, mercury, chlorine and chlorine treatment by-products, pesticides, hydrogen sulfide and other organic compounds. You experience safer, healthier and better-tasting water, without the hassle, expense and negative environmental impact of bottled water. It is very easy to install and maintain – only requiring occasional filter replacement. The high-capacity, high-performance filters last up to twice as long as other filters and provide maximum water flow – a difference you’ll notice when you turn on the faucet. A beautiful lead-free faucet included with the system is usually mounted on the counter as the primary source of drinking water, but with a wide range of optional parts and accessories, the CU-A4 easily adapts to fit nearly any refrigerator or ice maker connection. Our push-to-connect fittings and color-coded tubing simplify the installation process and minimize the possibility of leaks. Perfect for RVs, apartments or where space is at a premium, the CU-A4 is the best, most economical and flexible choice for clean, fresh, great-tasting water instantly.


  • Superior 4-stage multipurpose water filtration system for safer, healthier, better-tasting water. The advance 4-stage design, which includes both Ultrafiltration and KDF/GAC stages removes up to 99% of 700+ contaminants including LEAD, VOC, Chlorine while keeping healthy minerals. Note: This system does not reduce TDS as Reverse Osmosis system does.
  • 0.1 micron ultrafiltration (UF) stage removes up to 99% of most problematic pollutants such as chlorine and chlorine treatment by-products, lead, arsenic, and much more, while retaining healthy minerals
  • Simple, compact and flexible, the CU-A4 provides highly effective water filtration for any number of clean-water needs – at the sink, in the refrigerator, for coffee makers and more, with no storage water tank and no waste water, the CU-A4 is perfect even for RVs
  • Designed for high reliability, maximum flow rate and low maintenance, the CU-A4 uses High capacity cartridges that last up to twice as long as similar products. can be installed inline and used as a fridge filter
  • All filters, tubing and other water-contacting parts are manufactured to comply strictly with FDA and NSF/ANSI standards for safety and water quality, simple to install and simple to maintain, CU-A4 easy-twist cartridges simply twist on and off
  • Note: if you plan to use the CU-A4 as an inline filter without the included air-gap faucet, your incoming water pressure needs to be 40 PSI or below, if it is above that, a 40 PSI pressure regulator (APR40) should be installed on the input line to keep the pressure on the system at 40 PSI or below, please contact us if you plan to “tee off” the pure water line and connect it to your fridge, as you would need a regular RO faucet along with a pressure regulator


  • Brand: iSpring
  • Color/Finish: White
  • Chlorine reduction (%): 99
  • Contaminants Filtered: Lead, Chlorine, Iron
  • Copper Reduction (%): 0
  • Filtration Method: CTO, Carbon Block, Coconut Shell Carbon, GAC, KDF, Sand
  • Iron Reduction (%): 95
  • Lead reduction (%): 99
  • Maximum feed water pressure (psi): 50
  • Maximum feed water temperature (F): 100
  • Maximum filtered water flow (gallons per min.): 0.56
  • Minimum feed water pressure (psi): 20
  • Minimum feed water temperature (F): 40
  • Number of filters included: 4
  • Number of Stages: 4 Stage

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