Patent ID: 8640885

Claim:
A fluid treatment arrangement comprising: a hollow core assembly having an interior and an axis; at least first and second sets of fluid treatment elements mounted along the core assembly, wherein each set includes a plurality of fluid treatment elements, wherein each fluid treatment element includes a ribbon which has a permeable fluid treatment medium and is spirally wound in a plurality of windings to define a generally disk-shaped body having a radial dimension, a first end surface on one side of the body, a second end surface on the other side of the body, and an outer rim, wherein the first set of fluid treatment elements is arranged with first spaces between at least some of the fluid treatment elements, the core assembly including openings which fluidly communicate between the first spaces and the interior of the core assembly and wherein the second set of fluid treatment elements is radially displaced from the first set of fluid treatment elements a surround which encircles the first spaces and fluidly blocks an outer end of the first spaces, the surround being positioned between the fluid treatment elements of the first set and the fluid treatment elements of the second set; and a fluid flow path which extends generally edgewise through the permeable fluid treatment medium between the first and second end surfaces of a fluid treatment element of the first set and generally edgewise through the permeable fluid treatment medium between the first and second end surfaces of a fluid treatment element of the second set to or from the interior of the core assembly.