Before trying, I YouTubed videos and found the original demo helpful, so I bought it. My tub was backed up, and I finally got it to go down at a snail pace by plunging and shop-facing the drain debris that surfaced in the dark water. I followed the instructions and video. I made sure I only put enough boiling water onto the powder until it cleared. I waited half an hour and poured boiling water down. Still a snail pace.
Then with my fresh pair of maintenance eyes and plumbing theory thinking, I concluded that the clog just might be a double or triple clog. In our bathroom, the sink, tub, and toilet are all connected making way to the stack. My sink was draining slow when large amounts of water were added. So I decided to go from the other side and treat the sink. I treated the sink and flushed both the tub and sink with buckets of hot water. Just then the sink water went down so fast and my tub water followed with it. I also treated my toilet with the third pack and that opened up my drain even more. With the three packs provided, I was able to treat all three drains that connected together to get the job DONE.
P.S. I was patient.
Bottom Line: Yes, I would recommend this to a friend
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