Having got copd and get Bronchitis many times during the winter months, I tried going to a Salt Cave few years back and found it helped recuperate after the illness.
When I'm generally better during the summer I stopped going, but probably should have kept it up during the autumn to prevent getting ill again.
There are Salt Cave shops around London, not sure about other places, but they are opening more and more.
The idea is based on the real salt caves in Eastern Europe and Russia where many are now used as Wellness Clinics and hospitals for people with chest problems, as the pure salt air seems to purify the lungs over a period of time. ( a bit like being near the sea).
The Salt Cave franchise here, are usually converted shop premises with a room covered with salt walls and floor and seating for about 6 people.
The sessions are for 1 hour and you simply lie back in chair wearing a special cap and overshoes, while a fine mist of pure salt with ionised air is pumped in.
Afterwards you can feel the chest clearing enabling coughing up mucus more easily, but usually takes about 6 sessions to really feel the benefit, with 1 per week.
The only downside is that it cost around £30.00 each session depending on the offers available.
I've also got a salt lamp at home and pipe with pure salt crystals you can't use table salt as this has chemicals put into it), which I breathe which are both fairly cheap to buy on Amazon, and helps when I remember to do it.
I don't know what the medical evidence there is on salt, probably none, as per usual the pharmaceutical giants who control the medical profession in this country don't benefit, but I'll try anything that I think might help..
It's worth Googling it to see, and I wondered if anyone else here has tried this ?