Clack Filter Sand and Gravel are naturally occurring, river washed, glacial deposit products. Their excellent chemical properties - high silica content and low soluble calcium, magnesium and iron compounds - meet AWWAB100- 96 specifications. Precision sizing and uniform grading to close limits meet the rigid specifications of professional engineers throughout the world. For over 80 years Clack Filter Sand and Gravel have been satisfying the requirements of industrial, municipal and residential users. These products have been specified and used nationally and internationally because of their high quality, desirable chemical properties, color, and wide range of precision sizing. Processing and regular analysis of production are supervised by registered professional engineers. Clack Filter Sand is graded specifically for water filtration plants. It can be used in municipal, industrial or residential applications for sediment filtration. Clack Uncrushed Gravel has a highly spherical shape that promotes good flow and even distribution in support beds. Gravel is low in soluble impurities and it will maintain the quality of the treated water, especially in softeners. Three inch layers are recommended in graded support beds.
Clack Filter Sand is gradedspecifically for water filtration plants
Filter Sand can be used in municipal,industrial or residential applications
The spherical shape of uncrushedgravel promotes good flow and evendistribution
Color: Light tan to reddish brown
Density: 100 lbs./cu. ft.
Mesh Size: 18x35*
Effective Size: 0.45-0.55 mm*
Uniformity Coefficient: 1.6 or less*
Acid Solubility: 0.3-1.6%
Specific Gravity: 2.65-2.75
CONDITIONS FOR OPERATION
Bed depth: 18-30 in.
Freeboard: 20% of bed depth (min.)
Backwash flow rate: 15-20 gpm/sq. ft.
Backwash bed expansion: 20% ofbed depth
Service flow rate:
Municipal: 1.5-2 gpm/sq. ft.
Industrial: 3 gpm/sq. ft.
Domestic: 5 gpm/sq. ft.
*All physical properties and conditionsfor operation are the same for gravelwith the exception of mesh size,effective size and uniformity coefficient.