What you want to ask is what is the representative of molecules in blood purification? The representative of molecules in blood purification is electrolyte. Because of the basic knowledge and skill training of blood purification: the principle of hemodialysis, bacterial small molecular water molecules can freely penetrate erythrocyte albumin, often as the representative of molecular protein and electrolyte, and hemoperfusion uses the extracorporeal circulation of blood to introduce blood into hemoperfusion with adsorbent.