Dct Bio Drain Xl Is Designed For Optimal Maintenance Of Environments Such As: Drain Lines, Septic Systems, Grease Traps &Amp; Interceptors, And Holding Tanks Where It Reduces Build-Up, Prevents Back-Up And Keeps Systems Free Flowing.The Product Can Be Used As Preventive Maintenance For Drain Line And Grease Trap Maintenance Or To Increase The Rate Of Flow Through Drains.