Works Great!
Not sure how or why these little sticks work but the do!  I had a kitchen sink drain that was draining fine but had a foul smell.  It was noticeable even when standing a few feet away from the sink.  I was on the verge of calling a plumber when I came across these on Amazon and thought I would give them a try.  I put one stick in each side of my kitchen sink and within 24 hours the odor is completely gone.  I will keep these on hand and order more as needed.  Very impressed with this product!
Rating: 5 stars