iSpring RCC7AK 6-Stage Reverse Osmosis System ReviewThe Spring RCC7AK 6-Stage Reverse Osmosis System is one of the most popular and high-rated reverse osmosis systems in the market. And this model is a variation of another popular iSpring RO system – iSpring RCC7. The iSpring RCC7 is a 5-stage RO, while this Spring RCC7AK is a 6-stage RO system.

Compared with the RCC7, the RCC7AK comes with a remineralization filter, making it more advanced than its predecessor – the RCC7. Of course, you need to pay a little more to get this feature. Considering the water taste and health, it is worth doing that. This is because the RO membrane will not allow minerals to pass through. Therefore, the pure RO water doesn’t contain minerals, which will make water taste blank. What’s worse, the water will absorb a little amount CO2 and forms H2CO3, making the RO water taste a little acidic. If you have this one, you don’t need to worry about the plain water taste. Its remineralization filter will add healthy minerals back after the RO process, which will raise the pH of the RO water and make it more alkaline. This means you will have a fresh taste water and don’t need to worry about the loss of dissolved minerals.

And this under sink water filter has a higher water output. Generally, it can offer you up to 75 gallons of filtered water per day, which is enough for a big family. This means you have enough and instant pure water to drink and cook.

The ratio of the filtered water and the waste water is about 1:3, which is an average level for most under sink RO systems. However, the factual ratio may vary depending on the water pressure and other factors. Compared to other types of water filtration methods, RO systems can remove a wider range of contaminants, so it will produce more waste water.

This package also comes with anything you need to install it. And you can install it yourself without spending some money on hiring a plumber to do the job. If you are not confident, you can read its user’s manual or watch some videos before starting your installation. And you also can hire a plumber to do it for you. The whole process takes less than 1 hour. A storage tank and water faucet are included too.

Filtration System Design

Similar to the RCC7, it has a transparent plastic filter holder and all water filters sit in it. Therefore, you can see them clearly. And it is also designed to be easy to change their filters. Although it cannot beat some systems which only need you to pull out old filters and push in the new ones. Anyway, you can change this iSpring RO system with ease. Don’t worry about it.

Well, the changing process is not complicated. The steps are in the following:


  • Firstly, you need to use its plastic spanner wrench (together with this package) to loosen its housing.
  • Secondly, unscrew the housing by hand. There may be some water spilling out. It doesn’t matter.
  • And then, take out the old water filter.
  • Push the new water filter in place. You can apply a little Vaseline to its “O” ring.
  • Screw the housing.
  • Finally, use the spanner wrench to tighten up the housing.

Water Efficiency

To measure its efficiency, we need to know how much waste water it produces while producing 1 gallon of filtered water. Generally, this system will produce 3 gallons of waste water while producing 1 gallon of purified water. Therefore, 4 gallons of the feed water can result in 1 gallon of RO water and 3 gallons of waste water. However, water efficiency is influenced by the water pressure of the feed water. In a word, the level of its water efficiency is average, compared to most other RO systems.


Any RO system works under a proper water pressure. Too low or too high water pressure is not good to a RO system. Generally, this RO filter works with a water pressure of between 40 psi and 80 psi. If the water pressure is too low, it will lower its water efficiency and you will get more waste water. On the other hand, if the water pressure is too high, this may shorten the lifespan of the RO membrane and finally ruined the RO membrane. If this happens, you may need to change its membrane frequently – a waste of more money.

Therefore, a permeate water pump is essential for a lower water pressure and a pressure regulator is required for a higher water pressure. Before installing it, you need to measure the water pressure.

The installation is not complicated. Anyone with a little DIY skills can install it. And you can install it in 1 hour. Of course, you also can hire a plumber to install it for you, if you have no time or just would not like to do the job.

In most situations, you don’t need to drill a hole in the sink top, because most sink tops have a hole. And you also can take a use of the soap dispenser or the hand sprayer to install the filtered water faucet.

After reading its installation manual and you also don’t know how to start, there are some installation videos from iSpring and you can watch them first. After that, you can install your system step by step. From their videos, you can also learn how to change its filters.

Instead of supplying push fit connectors, this system offers only locking connectors. If you are familiar with the former ones, pay attention on this change. The difference is that you need to remove its clip first before pushing the pipes in place. It is also not complicated too.

If you are not familiar with these accessories, you can check out this list of the best reverse osmosis accessories to learn more.

Pros & Cons


  • Comes with a remineralization filter to add healthy minerals back
  • Purified water has a fresher taste, and is alkaline.
  • Excellent water output: 75 gallons per day
  • Replacement filters are affordable.
  • Able to remove up to 98% of contaminants, like chemicals, sediment, heavy metals, as well as other pollutants.
  • Comes with a 4-gallon storage tank
  • Comes with a 3-year limited warranty
  • Offers a 1-year money-back guarantee
  • Designed and made in the USA


  • The water efficiency level is average.
  • Don’t come with a UV light filter to furtherly kill bacteria and virus.


As one of the best RO systems in the market, the iSpring RCC7AK is easy to install and is highly recommended by many users. You only need to cost a bit more, you can get a RO system with remineralization filter. As a 6-stage RO system, this feature is good, making the purified water healthy and fresher to drink.

Although its filters have a slightly shorter lifespan than other RO under sink systems. Considering its lower price, this can be accepted. In a word, it offers the most cost-effectiveness.

If you are considering buying a new RO system, the iSpring RCC7AK will not disappoint you, based on its overall performance, ease of use and installation, affordability, price, rating and positive customer reviews.

iSpring RCC7AK 6-Stage Reverse Osmosis System Review

Leave a Reply

Your email address will not be published. Required fields are marked *