Solubility is not to be confused with the ability to 'dissolve' a substance, because the solution might also occur because of a chemical reaction. For example, zinc 'dissolves' (with effervescence) in hydrochloric acid as a result of a chemical reaction releasing hydrogen gas in a displacement reaction.
All three kidney, liver and lungs purify the blood. The lungs help remove carbon dioxide, the kidneys remove water-soluble waste and the liver removes fat soluble wastes and many other impurities from the blood....ref:http://www.pharmainfo.net/answers/pharmaquestion/which-organ-purifies-blood.
The liver filters over a liter of blood every minute. It is responsible for detoxifying, nourishing, replenishing, and storing blood. It also acts to energize the blood by releasing stored sugar, and it recombines amino acids to create the protein our bodies need to grow and repair tissue. Liver Qi Stagnation.