There are two shut off valves. A single is near the cold water line likely up for your cold and hot kitchen area faucet. It is on the line feeding the RO process. The 2nd one particular is found in addition to the metallic tank. Will not Enable anybody know http://news.southdakotachronicle.com/story/562596/advanced-water-rebrands-to-keep-up-with-changing-office-culture-and-cleaner-hydration-needs.html