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The ins and outs of reverse osmosis water treatment systems

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The ins and outs of reverse osmosis water treatment systems

The term “reverse osmosis” is probably something you haven’t heard since high school science class, but it may be more relevant to your life as a homeowner than you think. Reverse osmosis technology is used in a variety of water filtration systems, and having a reverse osmosis water treatment system in your home can provide you with great-tasting, highly filtered water straight from your sink. Today, we’ll be covering everything you need to know about reverse osmosis water treatment systems — including what makes them tick, how they can improve your water and how they stack up against other types of water filtration systems.

What is reverse osmosis?

When a plant draws water molecules through the soil around it into its roots, that is a type of osmosis. In the process of passing through the plant’s roots, most of the soil is filtered out so that the plant receives mostly water.

Reverse osmosis is simply the reverse of this process. In reverse osmosis water treatment systems (RO systems), water that contains contaminants is filtered through a membrane in the system with pores just large enough for water molecules to pass through. As water passes through the membrane, contaminants are removed, leaving only pure filtered water behind.

What contaminants can a reverse osmosis water treatment system remove?

Every RO system has three cylindrical canisters — a sediment and carbon prefilter housing, a reverse osmosis membrane housing and an activated carbon post-filter housing — that are attached to a manifold. The sediment and carbon prefilter housing eliminates large sediment chunks and contaminants that could clog or damage the reverse osmosis membrane. The reverse osmosis membrane housing is where the magic happens. The activated carbon post-filter housing acts as a failsafe and polisher, removing any last bits of sediment and making the water more palatable.

While specfic models vary in effectiveness, according to, a high-quality RO system can remove the following contaminants from your water:


  • Lead
  • Arsenic
  • Copper
  • Nitrates
  • Nitrites
  • Chromium
  • Selenium
  • Fluoride
  • Sodium
  • Cadmium
  • Phosphate
  • Radium
  • Chlorine
  • Barium
  • Bacteria
  • Cysts
  • Viruses

How reverse osmosis water treatment systems stack up against other water filtration systems

Whether or not an RO system is the best water filtration system for you largely depends on one thing: whether or not your water is hard. Only homeowners with soft water will be able to receive the full benefits of an RO system. Hard water often has such a high concentration of total dissolved solids (TDS) that it is almost impossible for an RO system to produce top-quality water.

If you have soft water or are willing to install a water softener along with an RO system, then RO systems are almost always a good bet. They create water that’s ideal for both cleaning and drinking.

If you’re interested in installing an RO system in your home, Delta Mechanical is here to help. For over 30 years we’ve been providing our customers with world-class plumbing, repiping and water treatment installation services. Contact us to learn more about what Delta Mechanical can do for you.

To learn more about what we can do for you, click here.

The Home Depot referred me to Delta Mechanical for the installation of our new garbage disposal and they did great 👍🏼 First Sveto Milanov arrived early and after installation cleaned up after himself. He was not talkative but answered my questions when asked. I will definitely use them again 👍🏼
Jorge Mendoza
Jorge Mendoza
September 20, 2023
Just had Sveto from Delta Mechanical come by and install my new GE Water Softener. He did an awesome job and I highly recommend delta mechanical for anyone.
Dana Rayhorn
Dana Rayhorn
June 5, 2020
After our home warranty company referred 2 companies to replace our water heater that were either inept or unavailable, we contacted Home Depot. They use Delta Mechanical. The gentleman that answered the phone was very knowledgeable and professional. He tried to get a tech to our house same day but being afternoon, that didn’t work out. The next morning Ivan showed up as scheduled at 8am. He was very polite and got straight to work. He finished our vented gas water heater install in less than 2 hours!! We’re very very pleased with Delta Mechanical!
jennifer buck
jennifer buck
November 6, 2019