A system for providing permeate water to a point of use , the system including a feed water line , a drain , and a permeate line to the point of use, the system comprising: a first filtration element positioned downstream from the feed water line; a tank positioned downstream from the first filtration element for receiving permeate water from the first filtration element during a tank fill cycle; a second filtration element positioned downstream from the tank; a first valve positioned downstream from the first filtration element and upstream from the drain ; a second valve positioned downstream from the first valve and upstream from the drain ; a first control line coupled to a first portion of the permeate line positioned upstream of the second filtration element and to the first valve ; and a second control line coupled to a second portion of the permeate line positioned downstream of the second filtration element and to the second valve ; the first control line configured to sense a first pressure drop (P1), the second control line configured to sense a second pressure drop (P2), the first pressure drop (P1) being less than the second pressure drop (P2) due to a backpressure provided by the first and second filter elements (102. 106); wherein the system is configured such that, in use, during a service cycle when the point of use demands permeate water, the first pressure drop (P1) in the first control line causes the first valve to open and the second pressure drop (P2) in the second control line causes the second valve to open so that permeate water from the tank flows in a reverse direction through the first filtration element to backwash the first filtration element and through the first valve and the second valve to the drain while permeate water from the tank simultaneously flows through the second filtration element to the point of use . a first filtration element positioned downstream from the feed water line; a tank positioned downstream from the first filtration element for receiving permeate water from the first filtration element during a tank fill cycle; a second filtration element positioned downstream from the tank; a first valve positioned downstream from the first filtration element and upstream from the drain ; a second valve positioned downstream from the first valve and upstream from the drain ; a first control line coupled to a first portion of the permeate line positioned upstream of the second filtration element and to the first valve ; and a second control line coupled to a second portion of the permeate line positioned downstream of the second filtration element and to the second valve ; the first control line configured to sense a first pressure drop (P1), the second control line configured to sense a second pressure drop (P2), the first pressure drop (P1) being less than the second pressure drop (P2) due to a backpressure provided by the first and second filter elements (102. 106); wherein the system is configured such that, in use, during a service cycle when the point of use demands permeate water, the first pressure drop (P1) in the first control line causes the first valve to open and the second pressure drop (P2) in the second control line causes the second valve to open so that permeate water from the tank flows in a reverse direction through the first filtration element to backwash the first filtration element and through the first valve and the second valve to the drain while permeate water from the tank simultaneously flows through the second filtration element to the point of use . <EOS>