5 Surprising Saltwater Hot Tub Facts
1. It’s not salty! The ocean’s water is about 3.5% salt, according to Science Daily. In other words, for every 1,000,000 molecules of water in the ocean there are 35,000 molecules of salt. The human tear is 9,000 parts salt per million parts water (ppm) and the human tongue can’t taste salt that’s less than … Read More
