ADSORPTION/FILTRATION (NSF/ANSI 42 & 53)
This process occurs when liquid, gas or dissolved or suspended matter adheres to the surface of, or in the pores of,
an adsorbent media. Carbon filters are an example of this type of product.
Materials Used in the NaturalSof 6L Multi-Media Backwashing System. Descriptions and
certifications as follows:
SRI SUPREME GRAVEL PACK #6
: Provides base and protection for bottom distributor in filter. NSF/ANSI 61
GARNET # 8 (2.0MM)
: When used in combination with the other filter medias, higher flow rates, higher loading,
and better filtration is achieved. High hardness reduces attrition and provides for years of reliable service. An
excellent support bed for other high density medias. Sediment filtration down to the 10-20 micron range. (the
average human hair is about 100 microns in diameter) NSF/ANSI 61
CLINOPTILOLITE, MESH SIZE 14X30 (0.55MM)
: natural media with a large surface area and microporous structure,
which can be used as a highly efficient filter media for the reduction of suspended matter. Viewed under an
electron scanning microscope, the granules reveal an angular shape, rough surface and microporous void spaces as
small as 3 microns. This creates a surface area over 100 times greater than silica sand. The angularity of the
granules and the tapered internal pore spaces allow for reduction of dirt, silt and organic matter suspended in
water by bridging, straining and adhesion. The rough surface and internal porosity provide a high surface area for
efficient reduction of suspended matter. Utilizing deep bed filtration can typically reduce suspended solids down
to the 5 micron or less range. (the average human hair is about 100 microns in diameter) NSF/ANSI 61
COCONUT SHELL-HIGH ACTIVATED CARBON
: granular activated carbon is designed for reduction of tastes, odors
and dissolved organic chemicals from municipal and industrial water supplies. Manufactured from select grades of
coconut shell coal to produce a high density, durable granular product capable of withstanding the abrasion and
dynamics associated with repeated hydraulic transport, backwashing and mechanical handling. Activation is
carefully controlled to produce exceptionally high internal surface area with optimum pore size for the adsorption
of a broad range of low molecular weight organic contaminants and oxidizing agents like chlorine and ozone. One
of the most common applications for Coconut Shell-High Activated Carbon (CS-HAC) is the reduction of the
undesirable tastes and odors present in many chlorinated water supplies. CS-HAC has been successful for many
years in the reduction of free chlorine from water supplies. The end product is clean, fresh water with no
objectionable taste or odor characteristics. NSF/ANSI 61
HIGH ACTIVATED CARBON (HAC)
: granular activated carbon is designed for reduction of tastes, odors and dissolved
organic chemicals from municipal and industrial water supplies. Manufactured from select grades of bituminous
coal to produce a high density, durable granular product capable of withstanding the abrasion and dynamics
associated with repeated hydraulic transport, backwashing and mechanical handling. Activation is carefully
controlled to produce exceptionally high internal surface area with optimum pore size for the adsorption of a
broad range of high and low molecular weight organic contaminants. Primary use in the municipal application is
the reduction of chloramine (chlorine and ammonia) and the disinfection byproducts caused by chlorination.
These include chloroform and other trihalomethanes (THMs). NSF/ANSI 61
