I've used only salt, but you can add any other seasonings of choice such as pepper or dried herbs. (saffrontrail.com)
They require little energy and can be designed to specifically reject or remove not only salt, but also common pollutants. (sciencedaily.com)
When we are really pressed for time, we have thrown the chicken thighs seasoned with only salt and pepper on the grill and skipped the flouring altogether. (mywifecancook.com)