Your EZChange filter is only as good as the cartridge inside it. This auto-delivery subscription makes sure you never have to think about it — replacement blocks ship automatically on your schedule, so your under-sink filter keeps doing its job without a reminder on your calendar. Each carbon block is engineered specifically for the HomeWater EZChange Single-Stage under counter system. The spill-free EZChange cap design means swapping the cartridge takes about 30 seconds and makes no mess — twist off the old one, twist on the new one, done. What it reduces: Chlorine, lead, VOCs, particulates, PFOA/PFOS, emerging contaminants, mercury, cysts, and turbidity. Approximate filter life: 4 months under normal usage. Higher-sediment water may require more frequent replacement. Compatible with the HomeWater EZChange Single-Stage Under Counter Water Filter only.