A. Multipure’s densely compacted ‘Solid Carbon Block’ filter has the ability to micro-strain every molecule of water through microscopic pores. Multipure’s filters are solid carbon block at 0.5 micron, meaning that Multipure filters micro filters the water molecules down to 0.5 of one millionth of a meter, which is 0.5 of one-thousandth part of a millimeter.