Actabs™ with its EPA registered biocide eliminates or prevents most blockages in air conditioning and refrigeration drain lines due to the build up of bacterial slime, rust, scale, sludge, air-borne dust, silt and other solids. Actabs™ patented dispenser when placed in drain pans will prevent water overflow in units for up to 3 months. Helps stop damage to floors, ceilings and equipment. Can be used in computer rooms.