2025 Nelsen Corporation Catalog - Catalog - Page 114
4 Filter-Ag®
Resins, Media & Chemicals
Filter-Ag®
Clack Filter-Ag® has many outstanding advantages over the more
common granular filter media used for suspended solids reduction.
Its fractured edges and irregular surface provides a high surface
area and complex flow path for efficient removal of suspended
matter through out the filter bed, typically reducing suspended solids
down to the 20-40 micron range. The larger particle size creates
less pressure loss through the filter and allows deeper sediment
penetration into the bed for higher sediment loading and longer
filter runs.
This large and irregular shape prevents the screening and caking
of sediment in the top several inches of the filter bed as happens
in the typical sand filter, thus preventing a rapid build up of head
loss and blinding problems. Filter-Ag®’s light weight means lower
backwash rates and better bed expansion to release trapped
sediment and rinse the filter media during the backwash cycle.
This ideal combination of particle shape, size and density make it a
good choice where quality water filtration and water conservation
are important.
Although not intended to be an iron reduction media, extensive
field experience has shown Filter-Ag®’s rough and jagged surface
to be very good at entrapping the fragile iron flock that forms
after dissolved iron has been oxidized. The fragmented edges
are apparently good flock collection points for the precipitated
iron. Typical oxidation methods include aeration, ozonization and
chlorination.
Substantial savings can be realized when designing a system
using Clack Filter-Ag®. Its low pressure drop, high service flow
rates and high bed loadings combined with lower backwash rates
allow economy in equipment downsizing and reduced pumping
requirements. Its light apparent density also saves on handling
expense and shipping costs.
Filter-Ag® can be applied to systems designed for either pressure
or gravity flow. Because of its unique density, Filter-Ag® can also be
used in multi-media (graded density) filter designs allowing a more
flexible approach to difficult filtration problems.
Advantages:
• There is less pressure loss through a bed of Filter-Ag® than
through most other filter media
• Light weight requires lower backwash rates than those required for
other filter media
• High service rates result in lower equipment costs and a
savings in space
• High sediment reduction capacity results in longer filter runs, with
a substantial savings in backwash water and time out of service
• Reduced shipping cost due to light weight/cu. ft.
• Replacement of sand with Filter-Ag® in existing installations
may increase filter capacity 100% or more. Caution should
be taken upon start-up that the lightweight Filter-Ag® is not
washed to drain.
Physical Properties:
Color ................................................................ Light grey to near white
Bulk Density .................................................................24-26 lbs./cu. ft.
Specific Gravity .................................................................... 2.25 gm/cc
Mesh Size ....................................................................................12 x 30
Effective Size ............................................................................0.67 mm
Uniformity Coefficient ........................................................................1.8
Hardness .........................................................................6 (Mohs scale)
Conditions for Operation:
Water pH range ....................................................................wide range
Maximum water temperature .............................................. 140°F/60°C
Bed depth.................................................................................24-36 in.
Freeboard........................................................50% of bed depth (min.)
Service flow rate ............................................... 5 gpm/sq. ft., although
.............................................. considerably higher rates are often used
Backwash flow rate............................................................ 8-10 gpm/ft2
Backwash bed expansion ....................................20-40% of bed depth
Upon installation allow bed to soak overnight before backwashing.
Certified to NSF/ANSI/CAN
Standard 61
Filter-Ag®
Filter-Ag® is a very efficient filter medium for the removal of suspended material and turbidity.
Less pressure loss and finer filtration is possible because of its light weight and irregular surface
characteristics.
Pallet quantity - 70 bags per pallet
FILAG
1 Cubic Foot Bag (25 lb.)
FILAG-50-BOX
1/2 Cubic Foot Box
FILAG-75-BOX
3/4 Cubic Foot Box
FILAG-100-BOX
1 Cubic Foot Box
4 - 12
For more information visit – NelsenCorp.com • NelsenWaterSolutions.com • VESTAwater.com
All prices and products subject to change without notice. ©Nelsen Corporation
