Nature 2 is a pool and spa water sanitizing system that uses elemental minerals to help reduce the chlorine needed to keep your water purified and bacteria free. Minerals make the water noticeably softer, and less chlorine means less red eyes, dry skin, or chemical odors. With Nature 2 your swimming or soaking experience is clean, fresh, and gently soothing. These products are tested and proven to sanitize water more effectively than with chlorine alone.