Resin trap device for use in ultrapure water systems and method of purifying water using same

A purification system for the production of ultrapure water comprising:

• a source of water;
• a resin bed comprising an inlet for receiving water from said source, a plurality of resin particles for intimately contacting the water and removing ions from the water, and an outlet;
• and
• a resin trap device external to said resin bed and in fluid communication with the outlet of the resin bed comprising:
• a housing, and
• a resin strainer disposed within said housing, said strainer including a plurality of openings having a particle pass size of between about 100 μm and about 250 μm,
• whereby water from the outlet of said resin bed enters said resin trap device, water and small particles having a diameter of less than the particle pass size flow through said openings and flow out of said resin trap device, and large particles having a diameter of greater than the particle pass size are retained in the resin trap device;
• and
• an ultrafilter downstream from said resin trap device for filtering the water to produce ultrapure water having a specific resistivity of greater than or equal to 18 M·ohm·cm at 20° C.;
• wherein said water purification system is free of microfilters having a maximum particle pass size of between 0.1 μm and 1 μm downstream from said resin bed and upstream from said ultrafilter.