Reverse Osmosis

Reverse Osmosis Water Filter Systems

With a drinking water filtration system that uses reverse osmosis, you can get water just as clean and delicious as anything you could get from a bottle from your own home tap. In fact, this same filtration technology is used by bottling companies to filter their water. Order your reverse osmosis water filter today and get free shipping with iSpring Water Systems!

iSpring Reverse Osmosis systems with NSF/ANSI 58 Certification

What Is an RO Filter?

A reverse osmosis filter, also called an RO filter, is a drinking water filter system that removes harmful chemicals, sediment, and minerals to create cleaner water. An RO water system is designed to improve water quality in your home, making it safer and better-tasting for drinking and cooking.

How Does a Reverse Osmosis System for Home Use Work?

A reverse osmosis (RO) filter system consists of multiple stages of filters, usually in three groups: pre-filters, the reverse osmosis filter, and post-filters.

  1. When the source water enters the system, it first goes through a set of three pre-filters, which remove large contaminants and protect the RO membrane from chemicals like chlorine and chloramines.
  2. After the pre-filters, the water molecules are pressed through the reverse osmosis membrane. This semi-permeable membrane features 0.0001-micron holes, equivalent to just 0.000000004 of an inch. This allows it to cost-effectively remove up to 99% of over 1, 000 harmful  water contaminants.
  3. The final stage of filtration uses a finer granular activated carbon filter called a post-carbon filter. This provides a final polishing before the filtered water is delivered to the faucet. There are also some add-on stages like Alkaline filter, Ultraviolet (UV) filter, etc.

The end result is water that is on par with the bottled water you'd get at the grocery store. In addition to the cost savings and convenience, widespread use of in-home filtration systems could reduce the impact of plastic bottles on the environment tremendously.

Read More to Learn About Reverse Osmosis Systems

  • why the reverse osmosis water is acidic
  • mild reverse osmosis Alkaline water

Which Add-ons Should I Choose for a Reverse Osmosis Water Filter

How Much Does a Reverse Osmosis Drinking Water System Cost?

When you're buying a reverse osmosis system, the cost will depend in part on its size: A simple under-sink RO filtration system for your home could cost less than $200, while a larger reverse osmosis filter system for a business may cost more than $600. At iSpring Water Systems, we carry a wide range of water filter systems to fit your capacity needs and your budget.

What Is the Good RO System for a Home?

The good reverse osmosis system for your home will vary depending on a few factors:

  1. How much room do you have under your sink to install an RO water system? Most reverse osmosis water treatment systems will take up a fair amount of under-sink space, but space-saving (tankless RO) and countertop options are also available.
  2. How much water do you use? An RO system for home use is typically capable of producing about 3 gallons of filtered water every hour, which is often plenty, but if you need a higher capacity, you should opt for a high-output or tankless system.
  3. How easy is installation? Ideally, you won't need to call a plumber to put in your new RO water filter system. At iSpring Water Systems, all of our products for sale are made to be DIY-friendly.

Can You Do Reverse Osmosis at Home?

Absolutely! Many homeowners choose to install an RO filtration system under their kitchen sink or anywhere else in the house where they want clean, delicious water to drink.

Do You Need a Special Faucet for Reverse Osmosis?

Most of iSpring’s reverse osmosis water filters require a specialized RO faucet. Our GA1-B Reverse Osmosis faucet is beautifully designed and easy to install. 100% lead-free and available in five different finishes, this unique faucet ensures that your family gets the most out of the under-the-sink RO water filtration system installed in your home.

Is Reverse Osmosis Worth the Cost?

The benefits of having a reverse osmosis water filtration system definitely outweigh the cost in the long run, especially if you find yourself constantly buying bottled water. Buying water in plastic bottles can cost hundreds or even thousands of dollars a year, and it wastes plastic as well!

How Do You Know if You Need a Reverse Osmosis System?

The most obvious sign that you could use an RO filter system is that your tap water doesn't taste good. But the best way to know for sure that you need a reverse osmosis system is to have your water tested, which will determine which contaminants are present in your water.

  • how to test my water quality - everything you need to know
  • Is my water safe to drink

How to Install a Reverse Osmosis Water Filter

Reverse osmosis installation typically requires a few short steps:

  1. Place the RO system under the countertop on the back or side of the sink base or in a spot you prefer. The system you purchase will provide instructions about the height the water filtration system works best at.
  2. Once you've hung the filter, turn off both water shutoffs and install the saddle valve included with the unit.
  3. Cut the color-coded water supply line to ensure that it's above the cabinet base. Then, fasten the tubing to the supply valve. A horizontal pipe is recommended to minimize the dripping sound.
  4. Choose a suitable flat surface on the sink or countertop to install the drinking faucet. If your kitchen sink does not have a pre-drilled hole, you will need to drill a hole, 1/2 inch to 1 ½ inch diameter.
  5. Shorten the supply and waste lines to the faucet so you don't have any excess tubing, but don't cut them yet. Attach the lines to the base of the faucet, and feed the waste lines through the base to keep them above sink backups. Make sure they have no connection to the supply.
  6. Fasten the faucet to the sink and install the drain line adapter under the sink. Now, you can cut the waste line so it flows downhill with no loops and then push it into the adapter.
  7. Filters posted in front of the reverse osmosis membrane are called "Prefilters". We recommend performing a prefilter wash every time you install or replace prefilters to prolong the RO membrane service life and maximize the system performance.
  8. Finally, set the storage tank into place, unwrap and insert the Reverse Osmosis Membrane into the housing and install the water line. Remember to flush the RO membrane as well for the best performance.
  9. The reverse osmosis water system you purchased will likely come with its own set of instructions for how to sterilize and fill the system once it's installed.
  10. Please refer to our RO system installation video here:

Buy Water Filters Online and Ditch the Bottles for Good

With our residential and commercial reverse osmosis systems, you'll never need to waste money on bottled water again. When you shop with iSpring Water Systems, you'll get a reverse osmosis filtration system that's simple to install, great customer service to help you pick out and hook up your new RO system, and fast, free shipping. Get the clean water you deserve: Order a new reverse osmosis water system for home use today!

Learn More About Reverse Osmosis Water Filtration Systems

  • Tank v.s. tankless reverse osmosis water filtration system - which is the best
  • Tips on how to install a reverse osmosis system

Page updated by Don Huie