In-line water softening filter of the Aqua Filter company. With the method of exchanging calcium and magnesium ions with sodium ions, it reduces the hardness of the water. Excellent build quality and performance, making it one of the best choices. Size Available: 2″x10″ Operating Temperature: 2 C – 45 C Longevity: 3-6 months (depending on feed water quality). Certified by: