What are the different processes used for producing ultrapure water?

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　　1. Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis unit → Intermediate water tank → Intermediate water pump → Ion exchanger → Purification water tank → Pure water pump → UV sterilizer → Microporous filter → Water usage point

2. Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis → pH adjustment → Intermediate water tank → Second-stage reverse osmosis (reverse osmosis membrane with a positive charge) → Purification water tank → Pure water pump → UV sterilizer → Microporous filter → Water usage point

3. Raw water → Raw water pressure pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis unit → Intermediate water tank → Intermediate water pump → EDI system → Purification water tank → Pure water pump → UV sterilizer → Microporous filter → Water usage point