@jmb73 For a long time my husband has had issues with sinus problems and coughing problems. He has had many x-rays and visits to specialists, various different meds etc. He has also used a CPAP for a long time too. Recently we decided to try turning off the moisture in it- the doctor said give it a shot. Almost immediately the coughing stopped and his breathing improved 100 per cent! So we have discontinued the water in the CPAP. He does use a corticosteroid as well and he still does need that but he is so much better it is amazing! Maybe this info will be helpful to someone!