The First Need Water Purifier is a versatile water purifying system that eliminates bacteria, cysts, and viruses. It effectively removes giardia and cryptosporidia while also getting rid of dirt and chemicals, such as pesticides and herbicides. With its easy-grip handle, you can comfortably pump water or use the included gravity feed kit for hands-free purification. This water purifier allows you to clean up to 150 gallons of water before you need to replace the canister, making it an excellent addition to your emergency preparedness supplies.