Clack Filter-Ag ® has many outstanding advantages over the more common granular filter medias 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 throughout the filter bed, typically reducing suspended solids down to the 20-40 micron range. Filter-Ag’s 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. The 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 buildup of headloss 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. The 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. Typical oxidation methods include aeration, ozonation 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 weight also saves on handling expense and shipping costs. 

Clack 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.


  • Deep bed filtration results in superior
  • water quality and reduces the load
    on downstream equipment.
  • High sediment removal capacity
    results in longer filter run, with
    a substantial savings in backwash
  • water and time out of service.
    High service flow rates result in
    lower equipment costs and a savings
    in space.
  • Reduced shipping cost due to lighter
  • Replacement of multimedia with
  • Filter-Ag Plus in existing installations
    may increase filter capacity.
    Filter-Ag Plus is an all-natural,
    environmentally safe product.


  • Color: White to off white
  • Dry Bulk Density: 50 lbs/cu.ft
  • Specific Gravity: 2.2 g/cc
  • Mesh Size: 14×30
  • Effective Size: 0.55mm
  • Uniformity Coefficient: 1.8
  • Hardness: 4-5 (Mohs Scale)


  • Water pH: Wide range
  • Max. Water Temp.: 140F/60C
  • Bed Depth: 24″-48″ (36″ for
  • optimal
  • filtration)
  • Freeboard: 50% of bed depth
  • Backwash Flow Rate: 14-18
  • gpm/
  • sq.ft.
  • Backwash Bed Expansion:
  • 30-40%
  • of bed depth
  • Service Flow Rate: 12-20
  • gpm/sq.ft
  • Influent water quality and
  • effluent
  • requirements may affect
  • operating
  • parameters
  • A gravel support bed is
  • required
  • Allow bed to saturate before initial