For infections of the lower sinuses, I recommend the Neilmed Sinus Rinse--available at most pharmacies--as it requires less effort and risk.
The Flip-Turn Sinus Flush (by friggy) removes infected mucus
from every part of your sinuses, which Mayo Clinic research shows is the cure for sinusitis, rather than treating sinus tissue with antibiotics. Regular saline irrigation does not work in the up
per sinuses, because of gravity, but the Sinus Flush defeats gravity.