Stimulation of aerobic biodegradation through controlled-release oxygen and nutrient delivery. For organic constituents amendable to aerobic biodegradation processes: Petroleum Hydrocarbons, light PAHs, BTEX. Significant cost savings realized through the use of EHC-O due to its higher oxygen release rate and lower price. O-Sox are available in sleeves or reusable stainless steel canisters, in varying sizes and longevities.