Microtox can be applied to a variety of matrices including drinking water, stormwater runoff, effluent, industrial discharges, soils and sediments.[1] Most samples do not require special preparation before testing besides adjusting the salinity to 2%.[2] However, samples that have certain characteristics, such as high turbidity levels, may require special preparation.[3] If samples require a salinity adjustment to lower the salinity, this can be accomplished by adding an appropriate amount of Microtox Osmotic Adjusting Solution to dilute the sample.