The metabolic breakdown of soybean oil in the aquifer (i.e., fermentation to H2 and acetate) is the critical first step to enhancing reductive dechlorination. But without emulsification, soybean oil would degrade so slowly that it would not effectively stimulate biodegradation processes. Soybean oil blends the desired biodegradability with longevity, allowing EOS® to remain effective in the aquifer for at least three to five years.