Drain & Septic Tank - Leach Field Rock Drain rock product prices vary greatly by region. Drain rock is rounded to partially rounded river rock, drain rock is not angular crushed rock. Angular crushed rock will compact tightly and limit drainage. 3/4" Drain rock 1" Drain rock 1-1/2 Drain rock 2" Drain rock 1-1/2 x 3 inch Drain rock 2 x 4 inch Drain rock
