I heard from a customer of ApneaLife that his ENT and him have decided against nasal rinsing more than 1x per month on the grounds that daily nasal irrigation could add too much moisture to the sinuses and that the sinuses are not equipped to deal with that much moisture -- in other words, that daily rinsing (what I do) could do more harm than good for the sinuses. any basis in fact for that claim?
Nasal irrigation should not over hydrate the nasal passages unless you are not using enough salt. It's all to do with osmosis. See, the mechanism of nasal irrigation.