Reverse Osmosis means the process of removing larger particles from drinking water.
The RO Membrane or simply membrane as we may call it is the most important filter for any reverse osmosis water purifier. When proper pressure of water is applied to the membrane it separates the impure water from the pure water. The membrane is generally in a housing which is made of plastic. It has 3 openings, one for input, one for pure and another for waste (impure) water. It is general misconception that only pure water is necessary for proper functioning of RO system but in reality, waste water is also necessary’s he waste water should also come in proper flow if the membrane is working fine,infact the waste water comes at a flow rate which is more than twice of pure water. To restrict this flow a Flow Resistor (FR) is placed after the waste water to minimize waste water. The RO membrane is a consumable item but generally has a long life if proper servicing is done every 3-4 months (quarterly service) by a qualified technician, the filters and membrane should be flushed at the time of service to ensure long life of the RO system.
There are many kinds of membranes available in market, according to GPD (Gallon per Day) for domestic systems membrane starts from 50 GPD to 100 GPD and come in many brands. Membrane is the main filter of the RO system and is necessary to give proper TDS value(total dissolved solids),the TDS is the main reading for water testing and should be between 30 to 80.In case your membrane is not giving proper flow or the taste of your water is not proper, do get your RO and TDS system checked.