Propur Water Filters 2 - 7" ProOne G2.0 SlimLine Filters ProOne G2.0 7 Slimline for Prepper Nomad and Prepper Big Recommended replacement: 8 months per filter. 12 months per pair Ideal to use with just about any water source - lake, stream, pond, pool, rain ProOne G2.0 SLIMLINE All-In-One Water & Fluoride filter Removes pesticides, herbicides, chloramines, chemicals and more