Sarjan Watertech India Pvt. Ltd. Supplies Commercial Reverse Osmosis System with Low Pressure Switches. Sarjan Watertech India Pvt. Ltd. Is an ISO 9001:2000 certified company. Commercial Reverse Osmosis System with Low Pressure Switches is available in the range from 50ltrs to 250ltrs. Commercial Reverse Osmosis System with Low Pressure Switches in their basic form is consisting of a pressure pump and a high pressure housing containing a semi-permeable membrane. Commercial Reverse Osmosis System with Low Pressure Switches is provided with the feature of rejection rate of contaminants from the water which is generally in the region of 90 to 99.5% depending upon the type of membrane used and water to be treated.