Sterile swabs are ideal for testing the level of contamination on surfaces. Swabs are very useful on hard-to-reach places such as crevices. Both mold and bacteria can be tested by culture methods from a single swab. It is recommended that wet swabs are used on dry surfaces and dry swabs on wet surfaces. Wet culture medium swabs are required for bacterial sampling.
Use sterile swabs when collecting samples for sewage screening for total coliforms, E. coli and fecal coliforms.