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What Are the Factors Affecting Reverse Osmosis Performance?

by Dr. Jonathan Doyle - Updated February 28, 2025
Reverse osmosis is one of the most popular water purification methods because it effectively filters out most impurities and contaminants from water. That way, it is healthy for human consumption or other commercial or industrial purposes. If you want to improve the quality and efficiency of RO systems , you must understand the factors that contribute to their performance.
This blog will explore how an RO system works, what affects its performance, and the best ways to make it more efficient.

What Is Reverse Osmosis?

Reverse Osmosis is a water purification technique that forces water through a semi-permeable membrane to filter contaminants and impurities. Only the water molecules pass through the membrane, leaving the undesirable substances behind. As a result, you end up with clean and healthy water to consume.

How Does Reverse Osmosis Work?

Ordinary osmosis naturally moves a high water concentration through a semi-permeable membrane to create a low water concentration. Reverse osmosis is the opposite, where hydraulic pressure is used to force a low water concentration through the semi-permeable membrane to make it a high water concentration, thus reducing the contaminants from the water.
filtration process

Factors Affecting Reverse Osmosis Performance

Not all RO systems perform equally. Numerous factors can impact their levels of effectiveness and efficiency, such as temperature, water pressure, and membrane quality. Here is an overview of the factors affecting RO system performance.

Water Pressure

Water pressure is a key factor in reverse osmosis performance. RO systems need enough pressure to successfully force contaminated water through the semi-permeable membrane material. The better the water pressure, the more purified the water will be after it passes through the membrane.
The water pressure should not be too high because it will cause more wear and tear to the RO system and consume more electricity. Of course, the water pressure should not be too low, either, because it will reduce the water flow and filtration efficiency. If that happens, the system will need more time to filter your water.

Water Temperature

Water temperature is another critical factor in reverse osmosis performance. For instance, a warmer water temperature lowers the water viscosity, allowing water molecules to quickly move through the semi-permeable membrane material. Cooler water has the opposite effect by slowing down the passage of the water molecules through the membrane.
tap water
For this reason, you’ll want your RO system to have warmer water for better efficiency and effectiveness. Just ensure the temperature is not too hot or cold because either can damage the membrane material and lower its longevity.
Look at the manufacturer’s instructions to see the recommended temperature range for your RO system. Keep it within that range to extend the life and efficiency of the membrane.

Water Quality (Feed Water TDS)

The amount of Total Dissolved Solids (TDS) in the feed water can significantly impact reverse osmosis system performance. TDS refers to the amount of contaminants, such as dissolved salts and minerals, in the water.
For example, if there is a high level of TDS in the water, the RO system will have to filter out more contaminants because there are many of them in the water. On the other hand, if there is a low level of TDS in the water, there are fewer contaminants to filter out.
a glass of dirty water
An RO system will have less efficiency if it needs to filter water with a higher TDS concentration because all the excess debris will clog the membrane. The only way to increase efficiency will be to add more water pressure to force the water through, which will end up damaging the membrane and reducing its lifespan.
If you have high TDS levels in your water, the best thing to do is pre-filter it before running it through the RO system. Pre-filtration does a good job of eliminating larger particles from the water before passing through the membrane. That will reduce the membrane’s risk of clogging during RO filtration.

Membrane Fouling

Membrane fouling is where excessive amounts of biological matter, particles, and materials build up on the RO membrane surface, reducing the water flow speed and filtration efficiency. Any water with high levels of organic contaminants, TDS, or minerals can cause membrane fouling.
The best way to stop membrane fouling is to regularly clean and maintain the membrane material of the RO system. You may even need to replace it if the membrane has already suffered too much damage or wear. The system manufacturer may recommend how often you must change the membrane. Follow their advice.
a glass of water

Flow Rate

The water’s flow rate will significantly impact the RO system’s performance. For instance, a high flow rate allows the RO system to filter water more quickly. However, the flow rate cannot be too high because the water won’t have much contact time with the membrane, resulting in lower filtration efficiency. The flow rate cannot be too low because more waste builds on the membrane and reduces efficiency.
To achieve the perfect balance between flow rate and filtration efficiency, choosing the right RO system is essential. The Waterdrop X12 Reverse Osmosis System is designed to deliver fast water flow while maintaining high filtration efficiency. With an advanced 1200 GPD capacity, it ensures a steady supply of purified water without compromising on performance. The system also features an 11-stage deep filtration process, effectively reducing contaminants. If you’re looking for an RO system that optimizes both speed and purity, the Waterdrop X12 is an excellent choice.

pH Levels

The feed water’s pH level impacts the membrane’s lifespan and the RO system’s performance. Excessively high or low pH levels can wear down the membrane if it persists for too long. That is why there needs to be a pH balance to prevent membrane degradation.
Check the pH range recommendation from the RO system’s manufacturer to determine the proper pH level for the feed water. Then, regularly test the feed water to ensure the pH levels continue to fall within that range. If the pH levels are off, make the proper adjustments to get them within that range.

How to Improve Reverse Osmosis Performance?

Here are some tips on how to maximize the performance of your RO system:
  • Maintenance: Periodically clean the filters and membrane materials to remove fouling and increase filtration efficiency. Replace filters if they show signs of damage.
  • Test Water: Conduct regular water testing to determine the levels of pH and TDS. If they are too high, pre-filter or treat the water as needed.
  • Check Temperature and Pressure: Verify that the feed water is at the proper temperature and water pressure.
  • Use Pre-Filters: Put your water through a pre-filtration process to ease the stress on the membrane and lower the risk of damage to it.
water test

Conclusion

Reverse osmosis is one of the most powerful, dependable, and adequate water purification methods to produce clean and healthy water to drink or use for other applications. Just remember that the performance of an RO system is the key to its filtration efficiency. It should perform to its maximum potential if it undergoes proper system maintenance and has the proper water pressure, quality, and temperature.

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Contaminants Detected in  Fruitland Water Special Service District
30
Contaminants
EXCEED EWG HEALTH GUIDELINES

30  Total Contaminants in Your Water

Water Provider

Fruitland Water Special Service District

Population Affected

120,000

Water Source

Ground water
Exceeds Guidelines

Others Detected

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