Carefully push down on childproof cap with palm of hand and turn cap counterclockwise. Don't squeeze bottle or splash product. (Clean up any spills at once.) To lock cap, push down on cap and screw on tightly.

For slow-running drains, run warm water (not hot) through drain for one minute.

Turn off water and pour one-fourth of a 64 oz. bottle directly into drain. Briefly run water again (approximately two cups) to activate and distribute formula along pipe walls.

Allow enzymes to work overnight or while at work (six to eight hours) before running water in drain again.