Flow restrictor(FR) purpose flow restrictors (also known as Flow Controls or Capillaries) are required for all reverse osmosis systems
It is recommended that the flow restrictor is replaced each time an RO membrane is replaced in order to keep your system working at optimum performance, as scale build-up can occur and clog the capillaries
RO-FR is made by food grade plastic only, Enogh strong to pressure membrane waste and smooth to save RO membrane from blockage