Pequa Cess-Flo restores drainage fast. For sesspools, septic tanks, and drainfields. Nonpolluting, zero environmental impact. Contains no petroleum distillates or chlorinated solvents. poses no threat to underground water supplies. Fast acting. Container Size: 1 Gal Septic Size: 1500 Gal. Usage: 3 Monthly Treatments This item is banned in the following states: MA