Drinking clean, purified water is essential to robust health. Proper bone physiology and function depend on water that does not contain dangerous contaminants. Gravity-fed systems are nice and sometimes essential in the case of limited or no power environments.
British Berkefeld has a 200-year track record in water purification and knows what works. Many of their systems are NSF certified, which gives you the comfort of knowing that a large, independent testing group has found their products to be both accurate and reliable.