I have trouble with my sinuses year round, and was a bit skeptical that this tea would even put a dent in them. However, I was surprised how effective it has been. The flavor of the tea is a little on the sweet side, but overall I find it pleasant.
I have found that if you are a little congested 1 bag for 10 minutes and drink while hot. However, if you are in a bad way try 2 bags in 1 cup of water for 10 minutes. Hope it works well for you.