The product you referenced is an enzyme bacteriacide. Two enzyme systems most often asked about are Eco One and the Natural. Enzymes are not sanitizers and should be used with a low dose of chlorine to be most effective. Another choise would be a biguanide system such as Baqua Spa, LeisureTime Free or Spa Guard Soft Soak. Biguanides are a sanitizer. Many people love them, others dislike them. If you search the forums, you will find lots of info.