I am SO impressed with your product! I had a backed up shower drain which was miserable. I (embarrassingly) tried Draino first, and it did nothing! I used Drainbo, and immediately the shower improved, but the drain was still slow. However, every time I use the shower it drains better than before, after only 1 use of Drainbo! I can’t believe how great it works; I’m posting on facebook to tell all my friends! 🙂 Thank you for providing an environmentally safe product that works great!