Vasu Chemicals offers Biocides Reverse Osmosis Water Treatment. Vasu Chemicals is an ISO 9001:2008 accredited company. Vasu Chemicals supplies a wide range of chemical & formulations. Biocides Reverse Osmosis Water Treatment use in membranes and pre-treatment plant. Biocides Reverse Osmosis Water Treatment has a broad spectrum of activity which will prevent the growth of biofilms on membrane surfaces, filter media and pipework.