We love our neti pots! It helps clear the nasal passages of pollen, dust, etc.
I use the grey sea salt from the grain & salt society.
Just make sure when you do the last step - removing the water from the nose - that you do a thorough job and follow the directions.
Otherwise, if water sits in your sinuses, it could cause you to have cold-like symptoms.
One of the best purchases we have ever made! Good luck!