Caravan Twin System can be used as a portable filter at home to improve the quality of your drinking water from tanks and town water supplies. This system can be used on mains pressure or water pumps. It can also be used to plumb in or used as a portable filter. You can use this system when you are traveling and when you are at home to make your own bottled water protecting you from Cysts. Anywhere anytime. This Caravan twin system reduces Giardia, Cryptosporidium Cysts, Chlorine, Chemicals, Bad Taste, Odors, Dirt, Rust, and Algae & Sediment for clean, safe and great tasting water where ever you are.