In fresh-water applications (such as pools, spas, water-features, etc.) salt is added to the water to produce a salinity of approx 3000 ppm (parts-per-million), which is 1/12th as salty as ocean water, or 1/3rd as salty as human tears. Pool-side plants and water-feature vegetation, in almost all cases, are unaffected by the low salinity water.