This is quite new to me, told about it from my sister in Australia where it is widely used.
I'm Astmatic who during the five months was having quite severe Asthma problems with constant coughing at night increased mucous and feeling quite breathless at times and shattered with constant loss of sleepat. My GP changed my inhalors three times ,not much improvement, then two lots of oral steroids one after the other.
They helped somewhat, but not dramatically.
Then I bought this Saline humidifier made in Innesfree ,Northern Ireland on line, direct from the manufacture in Nothern Ireland, that was after reading as much info, as I could find on various sites, including the manufacturers site, I followed other patients advice and put the humidifier in my bedroom turned on 1hour before going to bed then let it run all night ,truly from day 3 I slept most of the night without being woken by coughing
I'm pleased to say I sleep like a baby ever since just going into my 3rd month.
I would really recommend this humidifier to anyone who suffers from coughing at night or breathing difficulties associated with chest problems , it runs quietly can be set to full or part running. The cost of the humidifier is £135 with filter included the filter lasts up to 4 mths with continual nightly use replacements £35 but well worth every penny
The webb site can be found via Google , I used the manufacturer because they also sell the salt based filters with occaisional deals, also have a good they have a support line .