Negative ions and health: pseudo science or something more?
Charge separation at waterfalls with airborne ions, resulting in a potential between the base of the waterfall and the surrounding air, is a phenomenon examined by Philipp Lenard (Über die Elektrizität der Wasserfälle, Ann Phys (Leipz), 1892, 46, 584–636). 

The effect is real and more recent field studies, such as Characterization of ions at Alpine waterfalls, as well as studies on the formation of charged droplets, such as Charge Separation in the Aerodynamic Breakup of Micrometer-Sized Water Droplets should be taken seriously.

However, the sources that you cited are pseudoscientific marketing bullshit.

The first quote links to a web shop that offers marvels like magnetic bands and ion-balance bands. While the silicone band probably isn't hamful to the skin, it will not emit anything. Nada, nothing, nix!

The webshop behind the third link sells Himalayan salt lamps. It's a matter of taste to have a lamp housing made from unrefined sodium chloride with traces of iron in it (hence the colour), but I wouldn't expect any health effects through the emission of whatever from these lifestyle items. Himalayan salt is being sold for quite a while, even for nutrition but if at all, the stuff has seen the Himalaya mountains only from a distance. 

There are no halite mines in the Himalaya mountains.

Instead, the material is likely to come from the Salt Range in the Punjab province in Pakistan, or from Poland.

In summary, it's business as usual: Scientific facts are mashed up with esoteric mumbo jumbo to sell overpriced and useless stuff to well-meaning but naive clients.

Oh what a tangled web we weave,
When first we practise to deceive! 
-- Sir Walter Scott