This clean water slotxo health guide has 25 filter papers at a cost of 35 satang per sheet.It is estimated that between 600 and 700 million people around the world are estimated to be at the health and mortality risk from drinking unsanitary water. Especially in developing countries

Teri Dankovich, an American researcher, has developed a book "Water Filter" that will both educate and help filter clean water. This guide provides advice on how to practice healthy drinking water. It will give you instructions which are printed with safe bio-ink. There is also a picture for the user if the user cannot read.

It has 25 sheets of 1 mm thick silver filter paper that can be torn off and used as a water filter. With a cost of only about 35 satang per sheet

Each sheet of paper can be used to filter up to 100 liters of water.

Experiments of such books "Water Filter" in Bangladesh, Ghana and South Africa have been satisfactory.