Production process for ultrapure water equipment used for cleaning touch screens

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　1. Pre-treatment system → Reverse osmosis system → Intermediate water tank → Coarse mixed bed → Fine mixed bed → Pure water tank → Pure water pump → Ultraviolet sterilizer → Polishing mixed bed → Precision filter → Water user (≥18 MΩ·cm) (Traditional process)
2. Pre-treatment → Reverse osmosis → Intermediate water tank → Water pump → EDI unit → Purified water tank → Pure water pump → Ultraviolet sterilizer → Polishing mixed bed → 0.2 or 0.5 μm precision filter → Water user (≥18 MΩ·cm) (New process)
3. Pre-treatment → First-stage reverse osmosis → Chemical dosing unit (pH adjustment) → Intermediate water tank → Second-stage reverse osmosis (positively charged reverse osmosis membrane) → Pure water tank → Pure water pump → EDI unit → Ultraviolet sterilizer → 0.2 or 0.5 μm precision filter → Water user (≥17 MΩ·cm) (New process)
4. Pre-treatment → Reverse osmosis → Intermediate water tank → Water pump → EDI unit → Pure water tank → Pure water pump → Ultraviolet sterilizer → 0.2 or 0.5 μm precision filter → Water user (≥15 MΩ·cm) (New process)
5. Pre-treatment system → Reverse osmosis system → Intermediate water tank → Pure water pump → Coarse mixed bed → Fine mixed bed → Ultraviolet sterilizer → Precision filter → Water user (≥15 MΩ·cm) (Traditional process)