There are many filters in the body. The lymphatic system, lungs, kidneys, liver, colon and even the skin are filters. Two of the most important filters are the liver and kidneys. When kidneys are overworked the liver tries to pick up the slack and it is suggested that you always address the liver at the same time. Otherwise an "out of balance" condition will be created in the body.
Due to their importance in keeping us healthy, the Chinese call the kidneys "The Master Organ." Since all of our organs run on fluid, the kidneys regulate every organ of our body. Cleanse and support them and they can support you.