I've had a bad experience with this product. My unit piping is really old, so I get my sink drainage really slow or semi-clogged in the winter months. I normally use a similar product from another brand, but this product was on sale so I thought I'd give it a try.
I followed the instructions on the bottle. The instructions say that we can leave the liquid up to 15-20 minutes if the drainage is too slow or a bit clogged and then to run hot water. I did that, and, to my dismal, the sink drainage was totally blocked, like the water would not go down and flooded up. I removed the water and then added more product, thinking that perhaps that was what it was needed. It didn't help at all. The sink was totally clogged as a result and I had to organise a plumber coming home to have the sink fixed. So, I won't use this product ever again.
