Incoming water is pre-filtered with sediment cartridges initially, this prevents further stages such as the carbon stage from premature blocking. Chemicals such as chlorine, chloramines, herbicides and organics are treated with carbon to protect the RO membranes from chemical attack. RO quality water is produced at this stage.
For further purification, DI resin is used to polish the remaining salts and ions. RO and DI quality water both have pH that is acidic and further treatment is available using calcite cartridges to modify pH levels (SRCA). Stored RO or DI water is agitated through a recirculation loop that passes through an Ultraviolet (UV) disinfection system and 0.2 micron bacteria removal cartridge.