ClogBuster is non-fuming and safe for use on all plumbing fixtures that will pour through standing water. DIRECTIONS Open carefully. Slowly pour directly into drain opening. Avoid all splashing. If spilled, clean up immediately. Keep off aluminum, plastic, and floors. Clogged drains No need to remove standing water. Use 1/2 bottle and allow to work for 30 minutes. If necessary, repeat operation and allow to work for 1 hour. Flush with warm water. Slow drains Use 1/4 bottle twice at 15 minute intervals, flush with warm water. Prevention Use 1/4 bottle weekly. Allow to stand 30 minutes. Flush with water.