Double pipe for uniformly distributing flow

A double pipe for uniformly distributing a flow that is installed in a water purification device, where water purification is done in a plurality of filters by distributing and supplying source water to the plurality of filters,

• the double pipe comprising:
• an outer tube with a plurality of fluid supply holes penetrated through an outer surface thereof in a length direction, spaced at regular intervals, and a plurality of branch pipes protruded to communicate to the fluid supply holes and serve as a passageway that lets in water to the plurality of filters;
• and
• an inner tube, one end of which is open to supply the source water to the inside, and the other end of which is closed inside the outer tube, with a plurality of discharge holes formed on an outer surface thereof to discharge the fluid to the outside, wherein the other end of the inner tube is brought to a closed state by making tight contact with an inner side surface of the outer tube, and wherein a separate resistance member with a through hole penetrated therethrough to pass the fluid through is fitted in such a way as to wrap around the inner tube, in order to increase resistance to the flow of fluid flowing out through the discharge hole.