The Leaf whole house water system uses a multiple filtration stages: Sediment filter traps particulate matter like dirt, rust, sand. Activated carbon block filter adsorbs chemicals like chlorine and pesticides. UV light disinfects pathogens like bacteria. Remineralization adds healthy minerals back like calcium and magnesium. Final carbon polishing ensures clean, mineralized water. The easy-to-replace filter cartridge connects to the main water supply line. Leaf's app monitors usage and alerts you when a new filter is needed based on gallons filtered. It's an intuitive 'set it and forget it' whole home system.