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An ion exchange apparatus includes at least one fluid passage that extends between an inlet and an outlet for transporting a fluid having ions therein. At least one cartridge includes an ion exchange material and the cartridge has an ion removal rate of removing the ions from the fluid that varies i

An ion exchange apparatus includes at least one fluid passage that extends between an inlet and an outlet for transporting a fluid having ions therein. At least one cartridge includes an ion exchange material and the cartridge has an ion removal rate of removing the ions from the fluid that varies in response to a concentration of the ions in the fluid.

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What is claimed is: 1. An ion exchange apparatus comprising: a tubular container having an inlet at one end and an outlet at another end and defining a flow direction extending generally linearly from the inlet to the outlet; at least one generally linear and unobstructed fluid passage extending be

What is claimed is: 1. An ion exchange apparatus comprising: a tubular container having an inlet at one end and an outlet at another end and defining a flow direction extending generally linearly from the inlet to the outlet; at least one generally linear and unobstructed fluid passage extending between the inlet and the outlet for transporting a fluid having ions from the inlet to the outlet; and at least one cartridge having a porous outer structure defining an interior space and defining at least one porous outer surface arranged to be generally parallel to said flow direction and adjacent to said flow passage, said cartridge having an ion exchange material disposed within said interior space, the at least one cartridge having an ion removal rate of removing the ions from the fluid, and the ion removal rate varies in response to a concentration of the ions in the fluid. 2. The ion exchange apparatus recited in claim 1, wherein the ion removal rate varies in proportion to an interfacial surface area of the at least one cartridge with the at least one fluid passage. 3. The ion exchange apparatus recited in claim 1, wherein the at least one cartridge comprises two cartridges and the at least one fluid passage is located between the two cartridges. 4. The ion exchange apparatus recited in claim 1, wherein the at least one ion exchange cartridge includes a plurality of cartridges that vary in size. 5. The ion exchange apparatus recited in claim 1, wherein the ion exchange material includes anionic active sites and cationic active sites. 6. The ion exchange apparatus recited in claim 1, wherein the porous outer structure includes a first planar porous screen defining one porous outer face and a second planar porous screen defining another porous outer face spaced apart from the first planar porous screen. 7. The ion exchange apparatus recited in claim 1, wherein the at least one cartridge includes a frame supporting the porous outer structure. 8. The ion exchange apparatus recited in claim 7, wherein the frame includes a port and removable seal receivable within the port. 9. The ion exchange apparatus recited in claim 1, wherein the at least one cartridge includes a rectangular frame. 10. The ion exchange apparatus recited in claim 9, wherein said porous outer structure further comprises a first porous cover secured to the one side of the rectangular annular frame, and a second porous cover secured to the opposite side of the rectangular annular frame. 11. The ion exchange apparatus of claim 1, further comprising: a plurality of said cartridges each having an ion exchange material therein; the plurality of cartridges are spaced apart from one another and includes a first cartridge having a first size and a second cartridge having a second size that is different than the first size; and a plurality of fluid passages for transporting a fluid having ions, each of the plurality of fluid passages extending between corresponding ones of the plurality of spaced-apart cartridges. 12. The ion exchange cartridge apparatus recited in claim 11, wherein at each of the plurality of spaced-apart cartridges is oriented parallel to a fluid flow direction between the inlet and the outlet. 13. A method of controlling ion removal from a fluid flowing through an ion exchange apparatus, the method comprising: (a) providing the apparatus of claim 1; (b) establishing a first ion removal rate of the at least one cartridge when a concentration of ions in the fluid is at a first ion concentration; and (c) establishing a second, lower ion removal rate of the at least one cartridge when the concentration of ions in the fluid is at a second, lower ion concentration. 14. The method recited in claim 13, further comprising establishing a non-zero equilibrium of ions within the fluid. 15. The method recited in claim 13, further comprising establishing an equilibrium electric resistivity of the fluid between 0.2 and 5.0 Mohm-cm. 16. The ion exchange apparatus of claim 1, wherein said container includes stepped grooves that position the at least one cartridge. 17. The ion exchange apparatus of claim 16, wherein the stepped grooves position a first set of cartridges in relation to a second set of cartridges. 18. The ion exchange apparatus of claim 17, wherein the first set of cartridges axe aligned parallel and end-to-end with the second set of cartridges.