How does Gree dual-core water purifier WTE-PT63-2023 achieve dual-core and five-core?

1, PCU composite filter =PAC composite filter (PP cotton fiber layer+activated carbon fiber layer) carbon+rod filter element+ultrafiltration membrane filter element 2, RO membrane filter element (reverse osmosis membrane): Gree RO membrane filter element adopts patented multi-membrane winding membrane technology, which increases the flux of reverse osmosis membrane, increases the total amount of purified water, and has a better purification effect and a service life of three years.