Water purification system and method

A polishing cartridge in a water purification system for final purification of water for distribution to a point of use, said water purification system comprising :

• a closed water recirculation loop supplied at one point by a water inlet with water to be purified, and having at least one outlet point of use of the purified water, a pump and water purification means on the loop respectively downstream of the inlet point and upstream of the at least one outlet point, in the water flow direction, said system including two independent valves on the loop:
• a first two-way normally closed valve on the loop, for recirculation, to provide in the open position, recirculation of water purified by the purification means, via the pumping means, and a second two-way normally closed valve for distribution of said at least one outlet point of use and being disposed upstream of said first valve and of the at least one point of use outlet point so as to provide, in the closed position, recirculation of all of the water purified by the purification means towards said first valve;
• said system further comprising a first hydraulic connector comprising four ports that forms a distributor or manifold for said system and is positioned between said first two-way normally closed valve and said second two-way normally closed valve;
• and
• said cartridge containing a combination of an ultra filter having a cut-off below 13000 daltons for reducing the level of pyrogens and nucleases contained in said water and C18 grafted media effective for reducing the level of contaminants in said water.