Highly spherical shape and uniform grading provide Clack Flint Gravel with reliable performance. Clack Water Filter Gravels are naturally occurring river washed, glacial deposit products. Their excellent chemical properties, high silica and low soluble calcium, magnesium and iron compounds meet AWWA-Bl 00-96
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.