H Hydrex™ Comprehensive range of water treatment chemicals to suit all water treatment needs. Sludge treatment Hydrex™ Biocides Hydrex™ offers a range of biocides for many applications. Sludge treatment Hydrex™ Other Water Treatment Chemicals Hydrex™ offers solutions for each specific requirement in terms of chemical water conditioning, including tailor-made formulations. Sludge treatment W Whittier™ CoStrip Degasifier Veolia’s Co-Strip™ Degasifier offers an efficient alternative to vacuum degasification by using enhanced flotation technology with natural gas or nitrogen to strip dissolved gasses such as volatile organic compounds (VOCs) from produced water. Air Stripping