The APEC Tankless Reverse Osmosis System (RO + Alkaline) is a white water filter designed for home use in the kitchen. With a filtration method of reverse osmosis, this system is compatible with the RO + Alkaline model and comes in a pack of 1 unit. The APEC brand is known for its high-quality water purification products, making this tankless reverse osmosis system a reliable option for achieving clean and alkaline water in your home.