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 U Upthane™ Upthane™ is an Upflow Anaerobic Sludge Blanket (UASB) treatment system specifically designed for the treatment of low strength wastewaters like municipal sewage. Anaerobic Wastewater Treatment