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FILTER MEDIA
Structure and properties
Mineralogically, there are about 40 known types of natural zeolites (hydrated
silicates) of which clinoptilolite is the most common.
Clinoptilolite is classified as a crystalline aluminum, silicon, oxide mineral
(Berkhout 2002; Rempel, 1996). This report describes a high purity 14 x 40
mesh, approximately 55 lb/cu. ft. bulk weight, clinoptilolite (zeolite) from the
western US that has a high porosity, high surface area, a micro-crystal
structure, and is abrasion resistant.
Performance and advantages
Since the mid-1970s, lab and field test data reports in the US have indicated
that zeolite filtration media has consistently outperformed sand,
sand/anthracite and multimedia in both pressure vessels and gravity filtration
tests (e.g., Foreman:1985: Johnson & Petersen, 2001 Hansen, 1997:, Johnson
et al, 1997; Fuger, 2003).
Generally, the filter beds have 1.7 to 1.9 times the solids loading capacity/ft3
and superior filtration performance versus multimedia.
Based on more than 100 lab and field tests (2/3 using pressure vessels and 1/3
using gravity beds) since the mid-1990s representing commercial, residential
and industrial water filtration projects, it has been concluded that high purity
zeolite media is superior to conventional granular media.
Our test results using pressure vessels indicate:
For solids loading capacity, high purity surpassed multimedia, sand/anthracite
and sand; FBT media more effectively removes fine particles in the 0.5µ to 10µ
range that escape conventional media (see Table I below).
