After I get a sinus infection, I take a full course of Antibiotics . I then flood my sinuses with a mixture of diluted 3% hydrogen peroxide, baking soda and kosher salt to prevent re-infection. I continue to do daily sinus floodings until my sinus discharge is clear and thin. I also do sinus floodings if I feel that I might be getting another sinus infection, in order to prevent a sinus infection.
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As a result of doing sinus floodings, I have now gone about four years without a sinus infection or a re-infection. Before that, I used to get several sinus infections every year.
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I documented my experiences and what I have learned about sinus flooding at: http://home.bellsouth.net/p/PWP-upsidedown