iSpring RCC7 Under-Sink 5-Stage Reverse Osmosis Review

We all know it is important to drink plenty of water every day. For many of you, a great percentage of this daily intake probably comes from the tap water at your home. But can your tap water be doing you more harm than good?

According to a New York Times blog, most people would benefit from drinking filtered water. Raw municipal tap water, although regulated, can contain harmful pollutants like arsenic, lead, chlorine, radon, nitrates, and pesticides.

One type of filters that are actually effective at removing most of these pollutants are reverse osmosis filters. Today we’re reviewing one of the most popular products in this category, the iSpring RCC7 High Capacity Under-Sink 5-Stage Reverse Osmosis filter system.

iSpring RCC7 Review

As we’ve just said, the iSpring RCC7 is a reverse osmosis filter. It is meant to be installed under your kitchen sink and filter the water that comes out of your kitchen faucet, making it safer for human consumption. To this end, this system uses reverse osmosis, a process that purifies water by removing molecules, ions, and also soluble impurities from water through the use of a semipermeable membrane.

By design, reverse osmosis water filter systems are composed of many filtering stages, and the RCC7 is no exception. Reverse osmosis is actually used in only one of the stages, whereas the other stages use carbon and sediment filters to complement the action of the reverse osmosis stage and to make sure the membrane doesn’t encounter anything that can damage it.

This residential system is one of the most popular products by iSpring for its effectiveness at an affordable price point. The company has been continuously upgrading it to provide the best possible experience for its customers. Since its release, the feed water adapter, automatic shut-off valve, and storage tank valve were replaced with more functional versions, and it now comes with an improved brushed nickel faucet.

Furthermore, the quality of the filtered water has increased, with a new RO membrane in the 4th filtration stage and an upgraded carbon filter in the 5th. Even a water flood alarm was introduced. The user manual was also revised to match all these changes.

Who Is This Water Filter For?

The iSpring RCC7 is definitely for those who care about the purity of the water they’re drinking but don’t want to spend their entire life savings on a filtering solution. Reverse osmosis filters are known to combine efficiency and affordability, and the RCC7 is no exception. It is actually one of the best in the market as far as value for your money is concerned.

If you want a reverse osmosis water filter that is good at what it does, the RCC7 is for you. If you want a filter with every possible feature, however, you may want to consider other options. Some filters offer additional capabilities, such as a UV light to kill bacteria and viruses, or a remineralization stage that adds minerals and increases the water’s pH.

What’s Included?

The packaging of the iSpring RCC7 is simple and effective. It contains everything you need to get your filter up and running, save for some common household tools that you’ll need for the installation. The box contents are:

  • iSpring RCC7 manual
  • 3 pre­-filter cartridges and housings
  • 2 filters for the RO machine head
  • Brushed nickel faucet (lead-free)
  • 3.2-gallon storage tank
  • 1/4-inch food grade tubing
  • Check valve
  • Automatic shut-off valve

Pieces required for installation:

  • Membrane wrench
  • Filter housing wrench
  • Tank ball valve
  • Feed water valve
  • Drain saddle
  • Various inserts and fittings

Overview of Features

After all, what is the iSpring RCC7 High Capacity Under-Sink 5-Stage Reverse Osmosis really about? Let’s take a closer look at its features. We’ll start by dissecting the top-quality 5 filtration stages that even earned it a WQA Gold Seal certification.

The WQA Gold Seal means that this system underwent and successfully passed rigorous testing by WQA to meet some of the strictest NSF standards, namely the NSF/ANSI standard 58. Actually, many of the components included in the box were tested by an independent third party to ensure it conforms with NSF/ANSI standards.

Filtration stage 1 is a sediment filter that removes macroscopic particles and sediments from the water, as the name indicates. Stages 2 and 3 are both carbon filters that rid the water of chlorine, along with any foul odors, colors, and tastes.

Stage 4 is the main component of this system, which is the reverse osmosis membrane. It removes all sorts of contaminants from the water, such as aluminum, chromium, mercury, nitrate, and so on. This is topped off by a carbon filter that removes any cloudiness, taste or odor that may have been missed by the previous stages.

In terms of raw specs, the RCC7 is also not too shabby. An included storage tank means you can have 3.2 gallons of clean water at your disposal, at any time. It can output a maximum of 75 gallons of water per day, as long as the input water pressure is 60 psi. This should be more than enough for most people’s needs.

Remember that the water you feed to the system needs to meet certain requirements. It cannot be used with hot water, so the temperature should be between 40 and 100º F. Also, the pH should be between 3.0 and 11.0, and the minimum input water pressure is 45 psi, while the maximum is 70 psi.

How to Use It

The iSpring RCC7 installation is not extremely hard, but it is not quite simple, either. If you don’t feel confident about your plumbing skills, you should hire a professional. Either way, we’ll leave you with a video tutorial that can help you in this process.

The user manual can also help you with installation and filter maintenance. Remember, besides the initial investment, you’ll have to perform regular maintenance on the system by buying and replacing the filter cartridges. Stages 1, 2, and 3 should be replaced every 3 to 6 months, stage 5 should be replaced every year, and stage 4 only needs to be replaced every 2 to 3 years.


The filtering capabilities of the iSpring RCC7 are beyond question, but it requires an input water pressure of at least 45 psi to be able to function properly. This can be a problem if your water supply pressure is low.

If this is your case, you can make a larger investment and get the iSpring RCC7P instead. Thanks to the booster pump, the water pressure requirements are lowered, so it works with water pressures ranging from 30 to 50 psi.


We’ve looked at the iSpring RCC7 High Capacity Under-Sink 5-Stage Reverse Osmosis as a solution to make tap water in your home safer to drink. Our verdict is that it is one of the best options available.

This is proven by the WQA Gold Seal certification it has earned for meeting strict NSF/ANSI standards. It is one of the best options available in terms of value for money. So, if you’re overwhelmed by the sheer variety of products available in the market and just want to get a standard top-quality system, the iSrping RCC7 is probably your answer.

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