Cobble filter material, also known as gravel, is used to filter water and find layers. Water treatment cobblestone filter material; 2-4 mm, 4-8 mm, 8-16 mm,16-25 mm; Shandong Linyi cobblestone production base,

After secondary screening and washing, the filter material of goose's seasonal gravel bearing layer is made of natural river channel excavation, screening and washing, which is spherical and natural light yellow or variegated. This product has no variegated color, the density is 2.66, the bulk density is 1.85g/cm3, the solubility of hydrochloric acid is 0. 12%, and the Mohs hardness is 1.22×. All the indexes meet the national standard of water treatment filter material (CJ/43-2005).