• Best Under Sink Filters Reviews 2016
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iSpring RCC7AK 6-Stage Reverse Osmosis Alkaline Mineral Water Filter System

Top-Rated Legendary Reverse Osmosis System with Alkaline/Mineral 6th stage, now with Free New Upgrades

The legendary iSpring RO system #RCC7 enhanced with alkaline (Corosex with calcite) that restores natural calcium and magnesium minerals removed during the reverse osmosis process. Featuring a six-stage filtration process, the 75GPD RO membrane incorporates polypropylene sediment (PP), granular active carbon (GAC), carbon block (CTO), Reverse Osmosis and Corosex with calcite technologies, and produces crisp-tasting, bottled-quality mineral water straight from your tap year after year.

Bottled quality drinking water right from your tap at 2 cents per bottle.
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Easy 4-color tubing connection: 1-9, 4-8, 5-7, 6-0
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How does it work? 6-Stage Filtration Produces Exceptionally Pure, Mineral Water

Every time you turn on a drinking faucet, source water passes through a 5-micron sediment filter that traps particulate matter — such as dirt, rust, and silt — that can affect the taste and appearance of your water, and potentially clog the system. A 5-micron GAC filter reduces chlorine taste and odor, as well as mineral oil, BTEX, Poly aromatic hydrocarbons (PACs), phenol, and halogenated substance. At the third stage, a denser carbon block filter removes any residual color, taste and odds (CTO), as well as difficult-to-remove chemicals such as chloramines. The system's fourth stage of filtration is especially important, as it involves the pressing of water through the NSF certified reverse osmosis (RO) membrane, the same technology used to produce bottled water. This semi-permeable membrane features tiny holes at a size of 0.0001 micron (µm) effectively removes arsenic, lead, perchlorate, chromium, copper, TDS (total dissolved solids), sodium, and a long list of other water contaminants. It also removes parasitic cysts, such as giardia and cryptosporidia. The 5th stage of filtration utilizes a finer GAC filter, which works as a final polishing filter when the water leaves the storage tank. The 6th stage features alkaline and mineral filter that adds a small amount of calcium and magnesium minerals (30-60 mg/l), just enough to make the water slightly alkaline and improves the taste. The end result is consistently great-tasting water at merely one cent per bottle. Besides helping your family, with any type of iSpring water-filtration product you use you may also prevent up to 16,000 plastic bottles from polluting the environment — all in the time it takes to use and replace a single filter.


By default every iSpring Water Filtration system comes with thirty-day money back policy and one-year limited manufacturer warranty. Please contact us directly if you have any questions or concerns.

Customer Support

iSpring is committed to 100% customer satisfaction. We love to help customers. Besides installation video on YouTube and Knowledge Base on our website, we provide US homeland based Customer Service via phone and email. Please don't hesitate to reach out to us before and after your purchase as your satisfaction is our business!

What's in the Box

#1st Stage — 5 micron 10 inch high-capacity polypropylene sediment filter in a transparent housing — removes sediments, dust, sand, particles, and rust. Certified to NSF/ANSI standards. #2nd Stage — 5 micron 10 inch Granular Activated Carbon (GAC) — gets rid of unpleasant chlorine, tastes and odors, cloudiness and colors. Compliant with NSF/ANSI standards. #3rd Stage — 5 micron 10 inch Carbon Block (CTO) — removes any residual color, tastes & odors, plus compounding pre-filters' efficiency and extending membrane's life. Compliant with NSF/ANSI standards. #4th Stage — 0.0001 micron High Rejection TFC Reverse Osmosis Membrane — heart of the RO system, produces bottled quality drinking water up to 75 gallons per day. #5th Stage — 1 micron 10 inch Total Polishing Inline Carbon — removes any possible residual tastes and odors from the tank. Compliant with NSF/ANSI standards. #6th Stage: Alkaline PH filter — producing a PH-balanced water and gives back healthy minerals. #Machine head and faucet #Tank — Premium 3.2 gallon pressurized tank. Certified to NSF/ANSI standards. #Faucet — Lead-Free, long reach, goose neck faucet. Compliant with NSF/ANSI standards. #Tubing — Food Grade 4-color tubing set. Compliant with NSF/ANSI standards. #Installation Hardware — Tank Valve, Feed Water Adapter, Drain Saddle, Teflon Tape, Two Wrenches, 3 spare O-rings, 2 spare Elbow Fittings, and User Manuals. #Plus Features — Pre-installed Automatic Shut-off Valve and the Check Valve work together to shut off the system automatically when the storage tank is filled up.

iSpring is located in Alpharetta, Georgia (678) 261-7611

Why iSpring?

Located in Alpharetta, Georgia, iSpring Water Systems are specialized in Reverse Osmosis systems for both residential and light commercial water treatments. Our products range from Reverse Osmosis (RO) Systems, Whole house water filter, RO Cooler, Shower filters, Counter Top Filter Systems, Filter Cartridges, Filter Housings, Kitchen Faucets and Fittings. Our aim is to make clean and fresh drinking water accessible to more households. We believe clean and safe drinking water should not be a luxury item but a must-have for every household. With affordable pricing, solid quality, and prompt delivery, we are committed to earn 100% customer satisfaction.

Upgrades since July 2014

Luxury Designer EU-style Faucet ($45 value): featuring Brushed Nickel with stainless steel look and ceramic valve, this quality faucet replaces small gooseneck chrome faucet to add elegant look to your kitchen.Feed Water Adapter (AF3M3Q2V): this all metal one piece 3/8 inch adapter makes installation a lot easier by connecting to well exposed cold water shut-off valve instead of the hard-to-reach kitchen faucet under-counter stem deeply hidden behind sink.Storage Tank Valve: some customers complained it needed more than 6 rounds of teflon tape to seal. The new version is of better quality and more durable .Automatic Shut-off Valve: some reviews complained it failed to stop water when storage tank is full. The new version is of better quality and more durable .The 5th stage (T33): some reviews complained about odd and smell residue in water. The new version is made with higher grade of carbon with stronger absorption capability.RO membrane: it is made with improved material from 3M and sharper cutting machine. The result is better rejection rate and more consistent quality.Water Detector/Flood Alarm($10 value): it functions like a smoke Detector but detects water by the highly sensitive probe.User Manual: featuring updated parts list, detail figs and straight forward 8-step installation instruction, it is the enriched paper version of the youtube installation video.

Technical Details

  • Easy to Install

Customer Reviews

The best tasting water and no need to buy bottled anymore!

121 people found this helpful.
 on October 23, 2014
By Studio Dweller
This system was recommended to me by a friend and after installing it and having it running for about three months I couldn’t be happier with it. The water is hands down the best I’ve ever tasted from any source and it’s completely eliminated the need to buy bottled water for my wife and I so it will pay for itself in about a year. I also bought a TDS meter to measure the total dissolved solids in our water (HM Digital TDS-4). Our tap water consistently measures 690-720 ppm which is extremely high and consequently, it tastes pretty terrible. Our previous faucet mounted Pur filter only made a marginal improvement. The water coming out of the RO system now measures at around 25 ppm and tastes amazing.

Taste Like Bottled Water!!!

260 people found this helpful.
 on July 3, 2012
By ReynerN
My old RO filter (with UV) was not working right, even after replacing all the filters. So I was looking for a new RO system with good reviews and decided on 2 systems: Tap Master TMAFC Artesian Full Contact Reverse Osmosis with Alkaline by Perfect Water and iSpring 6-stage with RO Alkaline. The Tap Master had tons of great feedback, but so was iSpring (the non-alkaline model). The only reason why I ended up purchasing iSpring was the price.

No more Chemicals.

116 people found this helpful.
 on March 20, 2013
By MacGuy
iSpring 6 Stage Reverse Osmosis System

Absolutely love it, and support was great. A+

10 people found this helpful.
 on December 22, 2014
By Dale T.
I was nervous about installing this as it was something new for me. Watch the video online before you order to be sure you can handle the installation. It’s not too tough. The most difficult part will be connecting it to your water supply. I didn’t have any connections under the sink so I needed to purchase a tap that would pierce the pipe. I contacted support to be sure this would be an acceptable method to connect and after sending them a few pictures they said it was fine. Support was responsive, which was great. For my troubles they sent me an extra set of filters! Excellent.

Great tasting, convenient, medium level install ability – had one hiccup during install – this may help you out!

4 people found this helpful.
 on January 24, 2015
By James K.
I put this in over New Years weekend and everyone has been in love ever since. No more 5 gallon jugs to lug and with 6 people using it all day, its hasn’t run out at all and we drink a ton of water!

Who Knew Water Could Taste So Good?!

 on March 8, 2017
By Rebecca Winter
Seriously, this water is delicious. My husband poo-pooed the idea of getting this filter because he feels our tap water tastes great. But, since installing it 5 months ago he constantly raves about the water. It really does taste surprisingly better. It was also very easy to install. I installed it myself following along with their video. I had to be vigilant to really push the plastic tubing in farther than I expected it to go, or I had a couple little leaks, but once I got the hang of it it was simple. I also bought their freezer line so we use this for our ice and that too was simple to install. I can’t give this enough stars!

Just canceled my water delivery service – Great System!

 on February 26, 2017
By USN Retired
After running to the plumbing supply store for a couple parts (to hook up an ice maker) the install took less than an hour. Was simple to do and had no real problems.

The system was easy to install

One person found this helpful.
 on May 26, 2016
By Renee M
We installed this in our kitchen and have found we all are drinking water instead of less healthy alternatives. The system was easy to install. It took us longer to get an old rusted accessory out of the hole than to actually install this and mount the new faucet.


One person found this helpful.
 on February 21, 2017
By Adam Yates
This system produces the best tasting reverse osmosis water I’ve ever tasted. It’s not difficult to install if you have a helper, and you’re organized, but the end product makes your investment of time and effort well worth it. Also, although the picture of the system makes it look really large, it actually is very compact, and fit easily under my sink. I really recommend this!



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