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The AquaPak uses cloth roughing filtration and solar disinfection to treat contaminated water. It is made from low cost polyethylene plastic (also used in food preparation boiling bags) with UV inhibitors added, and air-filled bubble pack sheeting (originally developed for the packing industry), the AquaPak can heat water to temperatures up to 65 degrees Celsius, a temperature that will kill waterborne pathogens using only sunlight. The AquaPak employs a reusable sealed glass tube indicator, called WAPI, filled with coloured wax at one end that melts when heated to the required temperature, indicating the completion of the pasteurization process. Depending on the availability of sunlight throughout the day, an AquaPak can produce up to 10 litres of water per day.