We developed a cheap and easy method to filter water contaminated with arsenic, fluoride and colifrom bacteria. The biosand filtration is the simplest solution; the procedure of setting up is also easy for people. The filtration container will start with pebble, gravel, crushed brick and biosand which is made from sedimentary rocks. After the water has passed through this process, it flows to the resin container which is filled with clay resin where aresenic is decreased to 0ppb. www.inespo.nl