The cleaning cycle for a pure water system is generally once every 3 to 6 months, but the specific frequency needs to be dynamically adjusted based on the system type, usage intensity, and influent water quality.
Cleaning Cycle by System Type
Reverse Osmosis (RO) System
Regular Cleaning Cycle: 3–6 months
If the influent water quality is poor (e.g., high hardness, high organic matter), or the SDI15 value > 5, the cleaning cycle should be shortened to 1–2 months.
Cleaning Triggering Conditions: Standardized permeate flow rate decreases by 10–15%, desalination rate decreases by 10–15%, or operating pressure increases by 10–15%.
Pretreatment Unit
Quartz Sand Filter: Backwash daily
Activated Carbon Filter: Backwash daily, replace and disinfect every 6 months
Security Filter Cartridge: Clean weekly, adjust according to raw water conditions
Water Storage and Delivery System
Water Storage Tank: Clean every 3–6 months
Delivery Pipeline: Disinfect every 1–2 months to prevent microbial growth
Ultrapure Water System (UPW)
High-requirement industries (e.g., semiconductors, pharmaceuticals): Perform system-level CIP cleaning (in-situ cleaning) and passivation treatment every six months to ensure sterility and pyrogen-free operation.
