U.S. EPA recommended. PolyTox™ is a blend of specialized bacterial cultures designed to provide simple, rapid and economical test results for the measuring of toxicity of wastewater to biological wastewater treatment systems. PolyTox™ works in less than thirty minutes and provides consistent results without the use of expensive instrumentation. Safe and environmentally friendly, PolyTox™ can be used to determine the toxicity of your sample by using a dissolved oxygen (DO) meter, BOD probe and a BOD bottle. Ideal for generating toxicity profiles, monitoring influent, tracing toxic shock origins, screening tankers before load acceptance and checking new chemicals to document effectiveness. 20 Vials / Pack. For best results, use within three months of purchase.