problems in Ayurvedic medicine.  A neti pot simply flushes the sinus cavity,
keeping it clean, and reducing the accumulation of germs, allergens, and dust.  
Those that use it regularly absolutely experience a decrease in nasal congestion,
sinus infections, and allergy related symptoms.

Dr. Oz (from the Oprah Show) recommends regularly using a neti pot.  
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The Neti Pot- Decrease Allergies & Sinus Congestion
From The Center: Natural Health Specialists