arkal water filtration systems operate using a specially designed disc filtration technology. thin, color-coded polypropylene discs are diagonally grooved on both sides to a specific micron size. a series of these discs are then stacked and compressed on a specially designed spine. when stacked, the groove on top runs opposite to the groove below, creating a filtration element with a statistically significant series of valleys and traps for solids. the stack is enclosed in a corrosion and pressure resistant housing.