Nutrition demands quality water. Although generally water filtering process requirements in the united states is quite good, it's believed that lymphoma is one of the fastest growing diagnosises in the midwest because some local water processes allow farm chemicals to pass through the water systems filtration systems at "too" high of a level to prevent high levels of farm chemicals in tap water. There is no conclusive data to prove this, but my Oncologists opinion is sufficient to motivate me to take these "additional" steps to ensure the quality of my water. It should be noted that this strategy also requires the periodic replacement of filter cartridges to keep the system up to minimum specifications.