Water purification system with automatic flush flow

An automatic flush flow for a water purification unit, comprising:

• a flush flow activation chamber comprising a substantially vertical tube that is fluidly coupled to a reverse osmosis (RO) filter to receive a brine water outflow at a top of the substantially vertical tube, and to drain through an aperture at a bottom of said substantially vertical tube, the substantially vertical tube having a float plunger therein for substantially occluding said brine water outflow through the aperture to a brine outflow port when in a first float seated position, and substantially permitting said brine water outflow to exit a water purification unit through said brine outflow port when in a second float unseated position;
• wherein when the water purification unit is not producing purified water or filling a reservoir, increased pressurization within the water purification unit allows the float to rise to the top of the vertical tube to the first float seated position, wherein when the water purification unit is producing purified water, pressure drops in the RO filter to create back pressure at the bottom of said substantially vertical tube until the back pressure reaches a float threshold level that draws the float out of the first float seated position to a second float unseated position, and wherein water draining from the vertical tube through the aperture when said float moves from said first seated position to said second unseated position generates back pressure on the RO filter to produce a sudden increase of tap water inflow, the increase of inflow to flush flow said tap water inflow through an RO membrane in the RO filter, thereby refreshing said RO membrane.

An automatic flush flow method for a water purification system, the method comprising the steps of:

• configuring a flush flow activation chamber comprising a substantially vertical tube that is fluidly coupled to a filter to receive a brine water outflow at a top of the substantially vertical tube, and to drain through an aperture at a bottom of said substantially vertical tube;
• configuring the substantially vertical tube having a float plunger therein for substantially occluding said brine water outflow through the aperture to a brine outflow port when in a first float seated position, and substantially permitting said brine water outflow to exit a water purification unit through said brine outflow port when in a second float unseated position;
• allowing the float to rise to the top of the vertical tube to the first float seated position as a result of increased pressurization within the water purification unit when the water purification unit is not producing purified water or filling a reservoir;
• drawing the float out of the first float seated position to a second float unseated position, as pressure drops in the filter to create back pressure at the bottom of said substantially vertical tube until the back pressure reaches a float threshold level when the water purification unit is producing purified water, and draining water from the vertical tube through the aperture when said float moves from said first float seated position to said second float unseated position to generate back pressure on the filter to produce a sudden increase of tap water inflow, the increase of inflow to flush flow said tap water inflow through the filter, thereby refreshing the filter.