Arkal's filtration systems use a specially designed
disc filtration technology.
Color-coded Polypropylene or Nylon discs are grooved on both sides to a specific
micron size. A series of these discs are then stacked and compressed on a
specially designed spine. When stacked, the groove on top runs opposite to the
groove below, creating a filtration element with a statistically significant series of
intersecting grooves which trap the solids. The stack is enclosed in a corrosion and
pressure resistant housing.
During filtration, the discs are tightly compressed together by a combination of the
spring's power and the differential pressure, thus providing high filtration
efficiency. Filtration occurs while water is percolating from the outer
diameter to the inner diameter of the element. Depending on the
micron rating (See table), there are from 18 (in 400 micron discs)
to 32 (in 20 micron discs) stopping points in each track, thus
creating the unique in-depth filtration (Figure below).
Disc Filtration Technology
Table of Filtration Grades of the Discs and Color Code
Color Code
Blue
Yellow
Red
Black
Brown
Green
Purple
Gray
Micron
400
200
130
100
70
55
40
20
Mesh
40
80
120
140
PP
Nylon
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