My name is Jenifer Olsen, and I am a licensed plumber in Minnesota. I received my license in 1989 and was the fourth woman in Minnesota to pass the test. I was constantly being asked by people what they could put in their drains to help keep them from plugging up. After trying many different products, I found  BIO-CLEAN. It is by far the best working product ever. Bio-Clean, a non-poisonous multi-purpose product, can only be sold by licensed service plumbers. It is safe, non-toxic and works. I stand behind this product 100%, and once you try it, you will LOVE it. It truly WORKS.