the Everpure 7SO Filter Cartridge designed to address hardness in water, preventing mineral buildup in coffee and espresso equipment. With its softening capabilities, this cartridge reduces minerals such as calcium and magnesium, ensuring optimal performance and prolonging equipment lifespan. Offering easy, sanitary cartridge replacement, internal filter parts remain uncontaminated, maintaining cleanliness. Suitable for water with hardness levels up to 30 grains per gallon (500 mg/L) at flow rates of up to 1/2 gallon per minute, it fits seamlessly into all existing Everpure heads. For best results, it is recommended to use the 7SO cartridge as the second cartridge in a QC Twin Series configuration head (EV9272-24), with a properly sized precoat filter cartridge installed beforehand.