Having access to safe drinking water is an absolute necessity. Be prepared with these PUR Purifier of Water packets. Includes 6 Pur Purifier of Water packets and a cotton filter cloth. Simple 4-step process provides you with 2.5 gal. of potable water in about 30 min. Each packet treats 2.5 gal. of water, for a total of 15 gal. Effectively removes dirt, cysts and pollutants while killing viruses and bacteria. PUR packets contain calcium hypochlorite 0.542 2.168 ppm available chlorine. Works especially well with the PUR Clean Drinking Water kit, sold separately.