TRAWAS is a complete portable microbiological laboratory for drinking water, recreational water and wastewater as well as beverage testing. Tests for coliform bacteria and Escherichia coli (E. coli) by the membrane filter technique are the most important routine microbiological examinations carried out on drinking water. TRAWAS is a complete portable microbiological laboratory for testing drinking, recreational and waste water as well as beverages. Tests for coliform bacteria and Escherichia coli (E. coli) by the membrane filter technique are the most important routine microbiological examinations carried out on drinking water. As one of the leading trading houses Wiegand International supplies all kinds of laboratories in research and industry worldwide.