The Propur™ Prepper King is our largest system and is ideal for high water volume situations. It is economical, convenient and easy to use. The system requires no electricity to provide reliable water filtration. 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 stainless steel for lasting durability and attractive appearance. The Propur™ Prepper King includes two ProOne® G2.0 9” SLIMLINE All-In-One contaminants & fluoride filter elements and can be expanded up to four filters for faster flow rate.