DIRECTIONS FOR USE:FOR COMPLETELY CLOGGED DRAINS: Remove standing water before pouring. Pour 4 ounces of drain opener into drain. Using more than 4 ounces could generate excessive heat, causing toilet bowls to crack. Allow to stand 15 minutes. Carefully and slowly add 4 ounces of water. Wait 5 minutes, then slowly run cold water. If drain is still clogged, repeat this procedure. Flush several times.
DANGER: THIS PRODUCT CONTAINS SULFURIC ACID.
AVOID ALL CONTACT WITH SKIN, EYES OR CLOTHING.