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. 

iSpring Quality H2O for Quality Life

Certified to NSF/ANSI 58

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.


iSpring RCC7AK NSF Certified 75 GPD 6-Stage Reverse Osmosis RO Drinking Water Filter System Under Sink With Alkaline Remineralization - Natural pH and Brushed Nickel Faucet

The RCC7AK multilayer membrane, rated for up to 75 gallons per day. The RCC7 line is one of America’s top selling brands of water filtration systems. All of our systems go through rigorous testing for air leaks, pressure and cycle resistance to maintain our own quality and performance standards. RCC7AK is certified against NSF 58/ANSI for TDS reduction (58 for reverse osmosis). With the 6th stage – an Alkaline Remineralization filter, the RCC7AK restores healthy minerals and produces a balanced alkalinity, giving the water a better taste. It uses all natural mineral stones as the filtration media and never sacrifices quality for quantity. Safeguard your health by choosing iSpring as your first choice!

iSpring RCC7P-AK Under Sink 6-Stage Reverse Osmosis Drinking Filtration System and Water Softener with Alkaline Remineralization, and Pump

The RCC7P-AK is a pressure-boosted, multi-layered filter system that can removes over 1,000 different types of contaminants, including arsenic, asbestos, chlorine, fluoride, lead, mercury, sodium, and more. Boosting the water pressure helps Reverse Osmosis filter stage increasing water production speed and reducing waste water. This is a suitable option when the home water pressure is low (below 40 PSI). 3 Pre-filters: PP sediment filter. Carbon KDF (GAC) filter. Carbon block (CTO) filter. They remove large contaminants and protect the RO membrane from chemicals like chlorine and chloramines. The heart of the system is the Reverse Osmosis (RO) filter that removes contaminants down to 0.0001 microns – so small that only water molecules can squeeze through but virtually nothing else.


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.

iSpring RCC7 NSF Certified Under Sink 5-Stage Reverse Osmosis Drinking Filtration System and Ultimate Water Softener, 75 GPD

When looking for the quality drinking water available, right in your home, look no further than the iSpring RCC7. This 5-stage, Reverse Osmosis-based filtration systems and point-of-use water softener removes up to 99% of over 1,000 contaminants, when the source water enters the system it goes through stages one, two, and three, collectively known as the pre-filters. The job of the pre-filters is to remove large contaminants and protect the RO membrane from chemicals like chlorine and chloramines. The fifth and final stage of filtration utilizes a finer GAC filter known as the post carbon filter. This provides a final polishing before the filtered water is delivered to the faucet.

Reinforced Transparent 1st Stage Housing

Provides a way to visually inspect the sediment filter and view the contaminants being removed from your water. With the transparent housing you will know it is time for a filter change before a problem occurs.

Quality Micron, Layered Protection

The advantage of having both 5-micron GAC & CTO filter is that the loose carbon (GAC) can trap large contaminants, leaving only smaller ones to the CTO carbon block filter. This allows the CTO filter and RO membrane to function longer.

iSpring RCC7AK-UV NSF Certified Under Sink 7-Stage RO Drinking Water Filtration System with Alkaline Remineralization and UV Ultraviolet Filter

Certified to NSF/ANSI 58, the RCC7AK-UV consists of 7-stage, layered filtration built around reverse osmosis (RO) technology that removes over 1000+ different kinds of contaminants. The combination of both GAC and CTO filters in the 2nd and 3rd stages provides more protection against harmful chemicals than CTO alone. It features a 75 gallon-per-day capacity RO membrane, it can handle the drinking water needs of even a large family. The RCC7AK-UV features an 11 watt UV lamp with a flow sensor switch turns the UV unit on and off automatically with water flow, saving power and lengthening the life of the UV lamp.

iSpring RCC1UP-AK 7 Stage 100 GPD UnderSink RO Drinking Water Filtration System With Booster Pump, Alkaline Ph+ Remineralization Filter And UV Filter

The RCC1UP-AK is an upgrade to the standard RCC7AK-UV system, equipped with a pre-installed booster pump to bring your water pressure up to the ideal level for the reverse osmosis process. The booster pump allows the system to function at the ideal level from production speed to drain ratio.The stage 6 alkaline remineralization filter remineralizes the reverse osmosis water while also neutralizing the pH. This filter contains half red mineral stone and half calcite, giving it the ability to produce bottled-quality mineral water.The 7th stage houses the system’s Ultraviolet UV Filter. A UV filter is a recommended choice for anyone filtering water from a well or directly from a natural body of water.

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.