CQ-S 100 Sediment Filtration Media

The CQ- S 100 Sediment media is a non-hydrous silicon dioxide media which can be used as a highly efficient filter media for the reduction of suspended matter. CQ- S 100® has many outstanding advantages over the more common granular filter medias used for suspended solids reduction. It's 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. CQ- S 100'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. 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. CQ- S 100®’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 makes 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 CQ- S 100® 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, ozonation and chlorination.

Substantial savings can be realized when designing a system using CQ- S 100®. 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. It's light density also saves on handling expenses and shipping costs.

CQ- S 100® can be applied to systems designed for either pressure or gravity flow. Because of its unique density, it can also be used in multi-media (graded density) filter designs, allowing a more flexible approach to difficult filtration problems.


  • There is less pressure loss through a bed of CQ- S 100® than through most other filter medias
  • Light weight requires lower backwash rates than those required for other filter medias
  • 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
  • Replacement of sand with CQ- S 100® in existing installations may increases filter capacity 100% or more. (Caution should be taken upon start-up that the lightweight CQ- S 100® 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
  • Uniform Coefficient: 1.8
  • Hardness: 6 (Mohs scale)


  • 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: 7 gpm
  • Backwash flow rate: 7 gpm
  • Backwash bed expansion: 20-40% of bed depth
  • Upon installation allow bed to soak overnight before backwashing


    • Service Flow Rate: Service flow rate is the maximum gallons per minute recommended for obtaining excellent water quality. Exceeding the service flow rate will cause a reduction in the product water quality.

    • Backwash Flow Rate: Backwash flow rate is the minimum gallons per minute recommended for proper reclassification of the media or resin. Insufficient backwash flow rate will cause inadequate media or resin reclassification and, over time, may reduce its effectiveness.

    • Calculating Your Flow Rate: You will need a watch with a second hand and a 1 or 5 gallon container to measure your flow rate with the instructions below.

      • Using the bathtub as the measuring point, open BOTH the hot and cold water faucets completely (If you have a well water supply, wait until the pump kicks on before continuing.)

      • Place either a 1 or 5 gallon container under the faucet and measure the amount of time it takes to fill the container in seconds.

      • Refer to the chart below. Find the row on the left that contains the size of the container you used to fill with water, either 1 or 5 gallons.

      • Then, find the column across the top that is closest to the number of seconds in took to fill the container.

      • The value in the table at the intersection of the row and column you determined is your flow rate in gallons per minute.

        Seconds to Fill Container 
        Container Capacity (gal)  5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
        1 12 6 4 3 2 2 1.7 2 1.3 1 1.1 1 0.9 0.9 1 0.8 0.7 0.7
        5 60 30 20 15 12 10 8.6 8 6.7 6 5.5 5 4.6 4.3 4 3.8 3.5 3.3

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