Fountains and ions
When I first started investigating the benefits of negative ions I heard that placing a fountain or pink Himalayan sea salt lamp in my home was one solution. While these items definitely are a source of negative ions their impact is limited to their immediate surroundings.
For this reason, if you are thinking about purchasing one of these items I suggest placing it in your entryway to create a more welcoming feeling for you and your visitors (you can find more information about the benefits of Pink Sea Salt Lamps here).
I personally have always had these beautiful and inspirational items in my home long before I ever heard about negative ions and the addition of negative ion generators has only served to increase those feelings.