TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The hydrogen sulfide generating microorganism is a non-pathogenic bacterium, where the non-pathogenic hydrogen sulfide generating bacterium is from the family Enterobacteriaceae, enteric bacteria. The non-pathogenic hydrogen sulfide generating bacterium is from bacterial family, Enterobacteriaceae, comprising Escherichia coli, i.e. the generating microorganism specie is E.coli, strain K12 (ATCC 25253).    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The synthetic waste water media is an aqueous media comprising at least a peptone, an animal protein extract, urea or urea-containing compound, at least one metal salt, a fiber-containing grain product and a cellulose-containing paper product. The peptone of the synthetic waste water media is a member chosen from bacto peptone, proteose peptone, soytone and tryptone. The animal protein extract of the synthetic waste water media is a desiccated meat extract, where the desiccated meat extract of the synthetic waste water media is a member chosen from beef extract, powdered beef heart, powdered beef liver and their mixtures.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal salt of the synthetic waste water media is an alkali metal salt and/or alkaline earth metal salt, where the at least one alkali metal and/or alkaline earth metal salt is a member chosen from sodium chloride, calcium chloride, magnesium sulfate, dibasic potassium phosphate and their mixtures. The fiber-containing grain is derived from oats and/or corn. The cellulose-containing paper product is toilet paper and/or facial tissue. Preferred Amounts: The synthetic waste water media comprises (in wt.%) peptone (4.0-6.0), meat extract (2.0-4.0), urea or urea-containing compound (1.0-2.0), sodium chloride (0.20-0.50), calcium chloride (0.10-0.30), magnesium sulfate (0.05-0.20), dibasic potassium sulfate (1.0-2.0), fiber-containing grain (6.0-8.0), cellulose-containing paper product (0.5-2.0), and sufficient water (100%). The hydrogen sulfide generating microorganism comprises a verified count of bacterium of at least log8 colony forming units/ml in liquid culture media. The verified count of bacterium is introduced into waste water for testing in an amount of at least 5.0 ml liquid culture per 500 grams of synthetic waste water media. The amount of verified count of bacterium introduced into the waste water produces a final organism count of not less than log4 colony forming units/ml in the synthetic waste water media. The concentration of waste water deodorizer introduced for testing is an amount proportional to the intended end-use amount of the product in real application, where a usage of 2.0-40.0 fluid ounces of deodorant per 40 gallon waste tank would equal about 0.19-3.91 ml of the waste water deodorant per 500 grams of synthetic waste water media.