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How often should reverse osmosis filters be changed ?

Are you wondering how often you should change your reverse osmosis (RO) filter to keep your water supply as clean and pure as possible?

You’ve come to the right place. As a leading supplier of reverse osmosis systems for over 10 years, our parent company at Aqua Kentro have gained extensive expertise and authority on this subject.

In this in-depth guide, we’ll break down everything you need to know about maintaining your RO system, ensuring it functions optimally for years to come.

Here’s a short video explaining how it works & when to change :

Summary Table:

Filter Type Average Replacement Frequency Signs It Needs Changing
Sediment Filter 6-12 months Reduced water flow or pressure
Carbon Filters 6-12 months Off-taste or odor in water
RO Membrane 2-3 years Increased TDS levels
Post-Filter 12-24 months Off-taste or odor in water

The Importance of Regular RO Filter Changes

  • Maintaining water quality
  • Prolonging the lifespan of the RO system
  • Preventing buildup of contaminants
  • Ensuring optimal system performance


The Different Stages of an RO System and Their Filter Replacement

Understanding the various stages of a reverse osmosis system can help you determine the appropriate time for filter replacements. Most RO systems consist of the following stages:

  • Pre-filtration (sediment and carbon filters): These filters remove larger particles, chlorine, and other chemicals, protecting the RO membrane from damage. They typically need to be replaced every 6-12 months.
  • RO membrane: The heart of the system, the membrane removes up to 99% of total dissolved solids (TDS) and other contaminants. It usually lasts between 2-3 years before requiring replacement.
  • Post-filtration (carbon filter or polishing filter): This final stage removes any remaining taste or odor issues and should be replaced every 12-24 months.

    Factors Influencing Filter Replacement Frequency

  • Water quality: The level of contaminants in your water supply can affect how often your filters need to be changed.
  • Water usage: The more water you use, the more frequently your filters will need to be replaced.
  • System maintenance: Proper maintenance of your RO system can help extend the life of the filters.

    RO Filter Replacement: A Step-by-Step Process

  • Turn off the water supply and release pressure from the system
  • Disconnect the tubing and remove the filter housings
  • Remove the old filters and clean the housings
  • Install the new filters and reassemble the system
  • Flush the system and check for leaks
    1. Scheduling Routine Maintenance Checks for Your RO System

    To keep your reverse osmosis system in top shape, it’s essential to schedule regular maintenance checks. These checks can help identify potential issues before they become significant problems, reducing the risk of system failure and ensuring optimal performance. We recommend conducting a routine inspection every six months, which should include:

    • Visual inspection of filters, tubing, and connections for signs of wear or damage
    • Measurement of TDS levels to assess RO membrane efficiency
    • Verification of water flow rates and pressure
    • Checking for leaks and addressing any identified issues

    Signs That Your RO Filter Needs Changing

  • Reduced water flow or pressure
  • Off-taste or odor in the water
  • Increased Total Dissolved Solids (TDS) levels

    The Benefits of Proper RO Filter Maintenance

  • Consistently high-quality water
  • Longer-lasting RO system components
  • Reduced risk of system failure
  • Improved overall system efficiency


Regularly changing your reverse osmosis filters is crucial for maintaining the quality of your water supply and the performance of your RO system. By following the guidelines provided in this comprehensive guide, you can ensure that your system continues to provide you with clean, pure water for years to come. Remember, as experts in the field with over a decade of experience, we at waterIIT are always here to support you in maintaining and cleaning your reverse osmosis system.

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