What Is an RO System? And How Does an RO System Work?
by Dr. Jonathan Doyle - Updated May 24, 2024
Access to clean and safe drinking water is a basic need but remains a challenge for
many people. Among the many water purification technologies available today, reverse osmosis (RO) stands out for
its efficiency and effectiveness. This article will explore how reverse osmosis
systems work to provide high-quality drinking water.
What Is a Reverse Osmosis (RO) System?
Reverse osmosis (RO) systems are a type of water filtration technology that removes
impurities from the water by using a semi-permeable membrane to filter contaminants while allowing only water
molecules to pass through. Improved water quality, making it safe and clean to drink.
Reverse osmosis systems are used in residential and commercial settings, where they
effectively produce high-quality drinking water from a variety of sources, including municipal supplies and
natural water bodies.
How Does a Reverse Osmosis System Function?
The RO water system purifies water by using a multi-stage filtration process. Here
is how it typically works:
Pre-filtration Stage
Water first passes through a sediment filter which removes dirt, dust, and rust
particles. Following this, a carbon filter eliminates chlorine and other organic contaminants that could damage
the RO membrane.
Reverse Osmosis Membrane Stage
The core of the system is the RO membrane, which is designed to remove dissolved
salts, lead ,
mercury, calcium, iron, asbestos, and other contaminants. Water molecules are forced through the membrane,
leaving these impurities behind.
Post-filtration Stage
Before the water flows from the faucet, it goes through a post-carbon filter to
polish the water, removing any remaining tastes and odors.
The multi-stage process ensures that the water is not only safe to drink but also
tastes clean and refreshing with no unpleasant odors or tastes, making reverse osmosis systems highly effective
for water purification.
Benefits of Using an RO Water Filtration System
There are several advantages to using a reverse osmosis (RO) water filtration
system:
Excellent Filtration
Reverse osmosis systems can effectively remove various contaminants from water.
such as particles, bacteria, viruses, heavy metals such as lead and arsenic, and chemicals such as fluoride and
chlorine).
Improved Taste and Smell
By removing impurities, a reverse osmosis system can enhance the taste and smell of
water, making it more enjoyable to drink. Useful if your tap water has a noticeable taste or smell due to
chlorine or other substances.
Cost-Effectiveness
While the initial cost may be higher than other filtration methods, reverse osmosis
systems are more cost-effective in the long run. They eliminate the need to buy bottled water, which can lead to
significant savings over time.
Environmental Benefits
Using a reverse osmosis system reduces reliance on bottled water, thereby reducing
plastic waste. This helps the environment by reducing the amount of plastic that ends up in landfills and
oceans.
Health Benefits
By filtering out harmful contaminants, RO systems provide safer, healthier drinking
water. This can promote overall health by avoiding waterborne diseases and exposure to harmful chemicals.
Easy to Maintain
Modern reverse osmosis systems are maintained with user-friendliness in mind.
Replacing filters and membranes is usually simple, and many systems have indicators to alert you when
replacement is needed.
The above benefits make the water system the equipment to ensure your home or
business gets clean, safe, and great-tasting drinking water.
How to Choose an RO Water Filtration System?
Choosing the right reverse osmosis (RO) water filtration system requires
considering several factors to ensure you get a system that effectively meets your needs. Here is a selection
guide:
Determine System Type
Determine whether you want a point-of-use system (such as an under-sink
water filter ) or a whole-house water filter. Point-of-use systems are typically used for individual
faucets and are less expensive, while whole-house water
filters filter all water entering your home but are more costly and complex.
Consider the GPD Rating
Consider the gallons per day (GPD) rating because it
determines how much filtered water the system can produce each day. For personal use or a small home, a system
with a 500 GPD rating may be sufficient. However, for larger homes or higher usage, you can consider a system
that provides 1000 gallons of water per day.
Look at Filtering Stages
More stages mean better filtering. Basic reverse osmosis systems start with three
stages, but more advanced systems can offer up to nine stages, adding features like UV sterilization or
remineralization to improve water quality and taste.
Assess Water Efficiency
Reverse osmosis systems require water to operate and produce wastewater. Modern
systems are becoming more and more water efficient and this aspect needs to be considered, especially in areas
where water conservation is a priority.
Assess Installation and Maintenance
Some systems may be easy to DIY install, while others may require professional
installation. Also, consider ease of maintenance and the cost and frequency of filter replacement.
Budget
Costs can vary greatly depending on the type, capacity, and features of your
reverse osmosis system. Basic under-sink models cost between $300 and $1200.
By considering these factors, you can choose the best
home water filtration system . This ensures you have access to clean, safe drinking water at home or in
the office.
Common Questions About RO Systems
How Often Should You Replace the Filters?
Typically, a pre-filter removes sediment and chlorine to protect the RO membrane
and should be replaced every 6 to 12 months. The RO membrane itself usually needs to be replaced every 2 to 3
years, depending on water quality and usage. Post filters are used to purify water before it flows into the
faucet and need to be replaced annually.
Do Reverse Osmosis Systems Waste Water?
RO water system uses additional water to flush away contaminants and maintain the
RO membrane’s efficiency. Modern RO systems have significantly improved water efficiency, reducing the amount of
water used in the filtration process. The byproduct water can often be repurposed for household tasks to enhance
their environmental sustainability.
Can an RO System Increase Water Bill Costs?
Reverse osmosis systems typically use 2 to 4 gallons of water to produce 1 gallon
of purified water but advances such as automatic shutoff valves make these systems even more water efficient.
These improvements help reduce the impact on water bills while ensuring safe and great-tasting drinking water.
Conclusion
This article discusses reverse osmosis (RO) systems, which purify water by forcing
it through a semipermeable membrane under pressure, improving the safety and taste of the water. Investing in an
RO System can ensure you and your family get access to clean and healthy drinking water all the time.
Contaminants Detected in Fruitland Water
Special
Service District
30
Contaminants
EXCEED EWG HEALTH GUIDELINES
EXCEED EWG HEALTH GUIDELINES
30 Total Contaminants in Your Water
Water Provider
Fruitland Water Special Service DistrictPopulation Affected
120,000Water Source
Ground waterExceeds Guidelines
Others Detected