The Propur™ Prepper Big is essential for an emergency preparedness plan or for daily use for you and your family. It is economical, convenient and easy to use. The system requires no electricity to provide reliable water filtration just about anywhere whether at home, office, vacation, camping or college dorm! Works with just about any water source including tap, lake, river, stream, pond and rain water. Ideal for emergency or daily use. Each container is made from high quality 304 polished stainless steel for lasting durability and attractive appearance. The system comes equipped with two ProOne® G2.0 7” SLIMLINE All-In-One contaminants & fluoride filter elements and can be expanded up to three filters for greater flow rate.