Essential Conditions and Procedures for Installing Reverse Osmosis Systems

Comprehensive Guide to Reverse Osmosis System Installation

Reverse Osmosis (RO) systems are vital for providing high-quality, purified water in various applications. To ensure the system functions efficiently and reliably, it is crucial to follow specific installation and operational protocols. This guide outlines the essential conditions and steps for the proper installation and commissioning of RO systems.

Essential Installation Conditions for RO Systems

Proper installation is critical to the success and longevity of your reverse osmosis system. Adhere to the following conditions:

  1. Storage and Environment:
    • After delivery, the RO unit must be stored indoors.
    • The ambient temperature should be maintained between 5°C and 38°C.
    • If temperatures exceed 35°C, ensure adequate ventilation to prevent overheating.
  2. Timely Installation:
    • The system must be installed within one month of delivery.
    • Immediately perform a water commissioning run to ensure operational readiness.
  3. Valve Handling:
    • Before initial water commissioning, do not open any valves to avoid the loss of protective solutions which could damage the membrane elements.
  4. Positioning and Leveling:
    • Once positioned, adjust the system’s support points to ensure it is level and has secure contact with its foundation.
  5. Pipe and Valve Preparation:
    • Prior to connection, degrease all pipes and valves that interface with the supply pump.
    • The flow-through parts of the supply pump should also undergo degreasing treatment.
  6. Output Pipe Height:
    • Ensure the maximum height of the product water output pipe is less than 8 meters to maintain system efficiency.

Note: Points 2 and 3 apply specifically to RO systems with pre-installed membrane elements.

Step-by-Step Commissioning Procedure

Proper commissioning ensures that the RO system operates at its peak performance. Follow these detailed steps:

  1. Water Quality Analysis:
    • Conduct a thorough analysis and testing of the feed water.
    • Confirm that the feed water meets the system’s specified requirements before proceeding.
  2. Pressure and Monitoring Adjustments:
    • Adjust the supply pump’s pressure controls.
    • Calibrate the automatic water quality monitoring system.
  3. System Integrity Check:
    • Inspect all pipe connections for completeness and security.
    • Ensure all pressure gauges are installed and operational.
    • Verify the tightness of low-pressure pipe connections and check for any missing components.
  4. Initial Pre-Treatment:
    • Open the pre-pump discharge valve and start the pre-treatment equipment.
    • Adjust the supply volume to exceed the system’s intake requirement.
  5. Valve Operations:
    • Fully open all pressure gauge switches, the intake valve, the concentrate discharge valve, and the product water discharge valve.
  6. Water Fill and Initial Startup:
    • Close the pre-pump discharge valve once the components are filled with water.
    • Close the system intake valve after filling.
  7. High-Pressure Pump Activation:
    • Ensure the inlet pressure of the high-pressure pump exceeds 0.2 MPa.
    • Start the high-pressure pump and gradually open the system intake valve while closing the concentrate discharge valve.
    • Maintain the total system pressure drop below 0.3 MPa.
    • Allow the product water to discharge for 2 minutes, then close the product discharge valve.
    • Operate the system for 15 minutes and check the functionality of all high and low-pressure pipes and instruments.
  8. Flow Adjustment:
    • Adjust the intake valve and the concentrate outlet valve to achieve a product water to concentrate ratio of 3:1.
  9. Conductivity Testing:
    • Measure the conductivity of the product water.
    • If it meets the required standards, open the product water outlet valve, then close the product discharge valve.

Key Points to Observe During Commissioning

  • Inlet Pressure Limits:
    • Ensure that the inlet pressure does not exceed 1.5 MPa during commissioning.
  • Temperature Adjustments:
    • If the inlet water temperature deviates from 25°C, adjust the recovery rate according to the temperature-product water output curve.
    • Maintain a recovery rate of 75%.
  • Desalination Efficiency:
    • After 4 hours of continuous operation, if the system’s desalination rate does not reach the design specification, inspect each component’s desalination performance.
    • Identify and replace any faulty components.


Following these precise installation and commissioning steps for your reverse osmosis system will ensure optimal performance and longevity. Proper adherence to these guidelines guarantees that the system provides high-quality, purified water efficiently and reliably. For expert advice and support in setting up your RO system, contact us today.

Xi’an CHIWATEC Water Treatment Technology is a high-tech enterprise specialized in various water processing devices. Aside from these individual products, which cover a number of types and series, we can also help with related comprehensive engineering projects. Thanks to our hard work and dedication upon our founding, we are now one of the fastest-developing water treatment equipment manufacturers in Western China.

Further reading

Industrial Water Purification System Machine RO

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