Check the listing for details. Walex Bio-Active Septic Tank Drop Ins White 12 Pack. Condition: New. Listed at 21.09 USD. Helps remove surface and bottom solids from septic tanksPrevents clogging of leach fields by dissolving solidsSafe for use in all plumbing applications Monthly use of BIO-ACTIVE will help reduce surface and bottom solids in the septic lank. Buildup of surface and bottom solids can carry over to the leach field and cause the leach field to become clogged. Once clogged, the system has nowhere to drain and the tank fills up, causing backup in the home and wet areas in the yard. Use of BIO-ACTIVE restores the biological population of good worker bacteria and enzymes which reduce solids. The beneficial bacteria also get carried over to the leach field to reduce solids and help prevent clogging. A clogged leach field is the biggest problem for septic systems and the hardest and most costly to repair.Simply drop packet in toilet and flush - use one per monthBillions of bacteria and septic specific enzymes per doseHelps prevent back-up and dissolves away solidsSafe for all plumbingQuantity: 12 Pack