Reverse Osmosis Water System: How it Works

As a homeowner, having clean drinking water is a top priority from a health and safety perspective. A common and effective way to ensure you have safe water is by installing a water filtering system. Water filtration systems can help reduce the  contaminants found in your supply, making it safe for consumption. One of the best filtration systems we often recommend to our clients is a reverse osmosis water system.

What is a Reverse Osmosis Water System?

A reverse osmosis water system is one of the most effective forms of water filtration. Unlike other systems that use chemicals or carbon for filtration, a reverse osmosis filter pushes water through a small, microscopic filter.

The small semi-permeable membrane has a pore size of about 0.0001 microns, allowing only water to pass through while catching any larger contaminant particles.

How Reverse Osmosis Water System

In biology, osmosis is defined as, “the movement of water molecules through a semi-permeable membrane from a region with a high concentration of water molecules to a region with a lower concentration of water molecules.” Reverse osmosis follows a similar process by using higher pressure to move the higher concentrated water molecules (contaminated water) through the filter to become lower concentrated water molecules (pure water).

The microscopic pores of the filter used in a reverse osmosis water system removes not only the contaminants you can see, but also eliminates contaminants you can’t see. Due to how effective this process is in removing pollutants, the water will often run back through a mineral bed to add back the beneficial minerals.

It’s also important to note that a reverse osmosis water system does not use any thermal energy and instead uses high amounts of pressure. If you have any questions on whether a reverse osmosis water system is suitable for your home, contact the plumbing experts at Chas Roberts.

Pros & Cons of a Reverse Osmosis Water System

Before you decide whether a reverse osmosis system is best for your needs, it’s crucial to understand the benefits and disadvantages.

Benefits of a Reverse Osmosis Water System:

  1. Removes All Contaminants. Unlike most other water filtration or water purifiers, reverse osmosis is the most effective way to remove contaminants from your water. Residential-grade reverse osmosis filters remove up to 90% of pollutants like, lead, arsenic, copper and much more.
  2. Helps The Environment: Instead of using bottled water, reverse osmosis is a safer and more environment-friendly option. Avoid filling the landfills with plastic water bottles by simply adding a reverse osmosis water system to your home.
  3. Mineral-Free Water: Reverse osmosis water systems are so effective at creating safe water, that some have even tasted a difference when using the water for cooking. For those who own aquariums, this water system is great at providing the purest water, free of human contaminants and minerals.

Disadvantages of a Reverse Osmosis Water System:

  1. Wastes Water: The biggest disadvantage of a reverse osmosis water system is the amount of wasted water. Studies have shown that these systems can waste 3-20 times as much water as they produce.
  2. Removes Healthy Minerals: As mentioned above, reverse osmosis water systems are highly effective at removing the contaminants and minerals. However, this also means that the healthy minerals can be removed when filtering.
  3. Installation and Repair Costs: Reverse osmosis water systems can be expensive. Installation of a system often requires help from a professional as the process can be difficult. Once the system is installed, it will require maintenance to properly ensure safety and effectiveness.

Learn more about reverse osmosis water systems or any other filtration system, from the expert plumbers at Chas Roberts.


A reverse osmosis water system is a highly effective filtration system that can help ensure that the water used in your home is safe for consumption. The plumbers at Chas Roberts are ready to help you find the best water system for your home.

Chas Roberts is the oldest and largest family-owned residential HVAC company in Arizona and has been in business for over 75 years. Contact us for quality, reliable service.