Water purification system

A filter unit for filtering supply water for producing filtered water in a purified water line for dispensing through a tap, which comprises:

• (a) a housing in which is disposed a flexible bladder for retaining filtered water and a pumping zone formed between said bladder and said housing;
• and
• (b) a hydroautomatic unit including a pressure-sensitive, normally open pumping valve having a pumping valve controlled chamber and a pumping valve controlling chamber, and a pressure-sensitive, normally closed drainage valve having a drainage valve controlled chamber and a drainage valve controlling chamber, said normally closed drainage controlled chamber having an input in flow communication with supply water and an output to drainage, said pumping valve controlling chamber and said drainage valve controlling chamber operating independently and each controlling chamber being in communication with said purified water in said purified water line,
• wherein when said tap is closed, said purified water in said purified water line flows into said bladder and supply water in said pumping zone flows out through said normally open pumping valve controlled zone to drainage, and
• wherein when said tap is open, said drainage valve pumping chamber closes and said drainage valve controlled chamber opens permitting supply water to flow though said open drainage valve controlled chamber directly into said pumping zone, thus forcing filtered water in said bladder to flow out to said purified water line and out through said open tap.

A filter unit for filtering supply water for producing filtered water in a purified water line for dispensing through a tap, which comprises:

• (a) a housing in which is disposed a flexible bladder for retaining filtered water and a pumping zone formed between said bladder and said housing;
• and
• (b) a hydroautomatic unit including a pressure-sensitive, normally open pumping valve having a pumping valve controlled chamber and a pressure-sensitive, normally closed drainage valve having a drainage valve controlled chamber, said normally closed drainage controlled chamber having an input in flow communication with supply water and an outlet to drainage, said pumping valve controlled chamber and said drainage valve controlled chamber in communication with a single controlling chamber, said controlling chamber being in connection with said purified water in said purified water line,
• wherein said pumping valve controlled chamber and said drainage valve controlled chamber being connected independently in parallel,
• wherein said pumping valve controlled chamber having an input in connection with said supply water and having an output in connection with said pumping zone, and wherein said drainage valve controlled chamber having an input in connection with said pumping zone and having an output in connection with drainage.

A filtered water storage unit for a storage device of a water purification system, comprising:

• (a) a housing;
• (b) a modified thermoplastic bladder for filtered water and being located inside the housing and being formed from a biaxially-oriented elastomer and integral rigid neck rigidly connected to said housing;
• and
• (c) a pumping zone for untreated water formed by a space between the modified thermoplastic bladder and the housing.

A method for producing from supply water filtered water in a purified water line for dispensing from a tap, which comprises the steps of:

• when said tap is closed:
• (a) passing purified water from said purified water line into a flexible bladder located inside a housing;
• and
• (b) withdrawing supply water from a pumping zone formed between said flexible bladder and said housing through an input to controlled zone of a pressure-sensitive open pumping valve, said pumping valve controlled zone having an output to drainage, said pumping valve also having a controlling zone;
• and
• when said tap is open:
• (c) closing said pumping zone controlled zone to stop withdrawal of supply water from said pumping zone;
• and
• (d) passing supply water from an output of a controlled zone of an open pressure-sensitive drainage valve into said pumping zone, thus forcing filtered water in said bladder to flow out to said purified water line and out through said open tap, said drainage valve also having zone a drainage valve controlling zone in connection with said purified water in said purified water line,
• wherein said pumping valve controlling zone and said drainage valve controlling zone operate independently.

A method for producing from supply water filtered water in a purified water line for dispensing from a tap, which comprises the steps of:

• when said tap is closed:
• (a) passing purified water from said purified water line into a flexible bladder located inside a housing;
• and
• (b) withdrawing supply water from a pumping zone formed between said flexible bladder and said housing through an input to a pumping valve controlled zone of a pressure-sensitive, normally open pumping valve, said pumping valve controlled zone having an output to drainage;
• and
• when said tap is open:
• (c) closing said pumping zone controlled zone to stop withdrawal of supply water from said pumping zone;
• and
• (d) passing supply water from an output of a drainage valve controlled zone of an open drainage valve into said pumping zone, thus forcing filtered water in said bladder to flow out to said purified water line and out through said open tap,
• said pumping valve controlled chamber and said drainage valve controlled chamber in communication with a single controlling chamber, said controlling chamber being in connection with said purified water in said purified water line,
• wherein said pumping valve controlled chamber and said drainage valve controlled chamber being connected independently in parallel, and
• wherein said pumping valve controlled chamber having an input in connection with said supply water and having an output in connection with said pumping zone, and
• wherein said drainage valve controlled chamber having an input in connection with said pumping zone and having an output in connection with drainage.