This is Red Flint crushed river under-bedding stone, 1/4 x 1/8. Red Flint Crushed River Under-Bedding Stone, 1/4 x 1/8 Red Flint’s Gravel Media is washed, kiln dried for smaller sizes, and screened to meet exacting specifications. The media comprises sub-angular, hard, durable, and dense grains of predominantly siliceous material. Extracted from a clean glacial sand deposit, Red Flint Sand & Gravel’s physical properties make it among the finest Sand media available worldwide for filtration applications.
