There Are Many Types Od Water Filters For Different Applications, Such As Countertop Water Filter, Undersink Water Filter, Commercial Water Purifier, Home Ro Water Purifier, Tap Filter, Shower Filter, Nsf Filters, Etc.The Reverse Osmosis System Can Be Devided Into Many Kinds With Different Characteristics Like Compact Reverse Osmosis System, Direct Flow Ro System, Quick Change Ro System And So On. How Does A Reverse Osmosis System Work? A Reverse Osmosis System Removes Sediment And Chlorine From Water With A Prefilter Before It Forces Water Through A Semipermeable Membrane To Remove Dissolved Solids.