Magnetic Particle Separation (MPS) is a process by which a polarized molecule can be broken down into its constituent atoms. For example, take magnesium hydroxide (MgOH). If they are put into a chamber with strong, oppositely charged magnets at either end, the bonds between the particles (K and HCl) will break and the positively charged magnesium particles will stick to the negatively charged magnet and the negatively charged hydrochloride particles will stick to the positive magnet. This process is very expensive (the magnets must be very strong) and so is not often used.