Roberts has been using Non Acid Drain Punch for about two years as a maintenance man at a large hospital. He and all the rest of the guys working there weren’t fans of acid based drain cleaners for obvious reasons and really didn’t like any drain cleaning chemicals. Until they tried the 50% sodium hydroxide formula in Drain Punch that is! No smell and it gets the job done. For additional information go to www.nonaciddraincleaner.com Thank you, Carl Lamberti