Everyone wants three things from their pool or hot tub: 1) Less chemicals 2) Clean, clear water every day (not just sometimes) 3) Less maintenance and headaches. ClearBlue achieves this by releasing mineral ions into the water which are a natural defense against algae, bacteria and viruses. First discovered in Roman times, mineral ionization was perfected during the NASA Apollo space program and has been used commercially in various water treatment applications for over 30 years. ClearBlue has adapted this technology for swimming pools and the results are spectacular. If you have a pool or hot tub, Think Minerals for the best way to maintain the water.