Sarjan Watertech India Pvt. Ltd. Supplies Thin Film Composite - TFC Membrane. Sarjan Watertech India Pvt. Ltd. Is an ISO 9001:2000 registered company. Thin Film Composite - TFC Membrane removes total dissolved solids to improve the taste and quality of water. Thin Film Composite - TFC Membrane even though it provides more water per day, is chlorine intolerant and used correctly only on potable, non-chlorinated water. Tap water is forced by pressure through a semi-permeable membrane while dissolved solids and particulates are left behind.