Makes sense to me. But they claimed to be chemical engineers. You have to be pretty bright to be a ChemE.
Maybe they have something biological in mind.
Not sure why they would say you need a truckload?
“Moreover, the ability of waterborne pathogens to cause massive outbreaks has been demonstrated. In 1993, a huge outbreak of cryptosporidiosis occurred in Milwaukee, Wisconsin. Cryptosporidium organisms passed undetected through two water treatment plants and are estimated to have caused more than 403,000 illnesses and 4,400 hospitalizations among the 800,000 customers served by the water system.19 Although this incident was not the result of bioterrorism, it demonstrated to public health professionals the vulnerabilities of populations to microbial contamination of treated water supplies. Cryptosporidium was first identified in 1907, but it was not recognized as a source of waterborne disease until 1987 when it was associated with a 15,000-person outbreak in a filtered system in Georgia.20 This suggests that there is much work to be done in improving our understanding of drinking water as a source of community illness.”
more here...