(8 customer reviews)

HD-9RO Post-RO/Inline Unit

Based on the successful design of the HD Series Whole House Units, the HD-9 is built to a high level of engineering standards to deliver optimal performance with rugged, heavy-duty durability.

The HD-9RO is offered in response to consumer demand for units that are easy to install after a reverse osmosis system or water filter without having to be handheld like our Portable Unit.

Install it between your RO tank and RO faucet to turn ordinary RO water into Natural Action Water.

Add it after a plumbed-in, below sink water filter such as a Multipure for revitalization before the water comes out of your filter faucet.

Also great for any unusual applications that feature a ¼” tube connection such as an icemaker or refrigerator.

The HD-9RO comes with ¼” Quick Connect ports, 3ft of ¼” tubing, and a mounting bracket.

This device produces revitalized structured water through a natural process of passive ionization utilizing paramagnetic materials and organized turbulence to produce natural ionizing effects improving the charge distribution similar to mountain spring water. Learn more about  ‘passive ionization’ technologies here.

Water Vault

It’s a one-time installation with a 10-year warranty and no replacement parts or maintenance when properly installed. 90 day customer satisfaction guarantee.


In stock


HD-9RO Install Guide

Questions? Contact us


Product Description and Health Benefits

Natural Action Product video
Play Video about Natural Action Product video

Additional information

Weight 3 lbs
Dimensions 15 × 7 × 5 in
NPT Fittings

1" inch NPT Fittings, 3/4" inch NPT Fittings

8 reviews for HD-9RO Post-RO/Inline Unit

Based on 8 reviews
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1-5 of 8 reviews
  1. This unit along with a Frizzlife Under Sink Water Filter not only made our water taste amazing, it shifted the PH of the water from acidic to alkaline.

  2. We’ve owned a hand-held NAT structured water filter for years, and have experienced the results first-hand, as well as introducing their technology to friends and family. It was only a matter of time before we upgraded and installed this one under our sink, and it significantly reduces our structuring time while keeping the water smooth, energized and happy. (yes, water can be happy… Google the recent scientific breakthroughs showing that water has memory!) Not only are we thrilled with the structuring, but NAT was able to ensure we received the product as expected and we experienced immediate and above-and-beyond customer service. What a great company. Our only other concern before buying this was that is might have been a counterfeit seller because of such limited reviews, but in good news this is the legitimate company and the product is 100% authentic. Thanks NAT!

  3. I am very pleased with the quality of softness this unit has added to my water. I feel better and enjoy the purity this unit creates. Thank you!

  4. I have continued my own home experiments drinking structured water which has me in such a state of euphoria, I couldn’t begin to explain it. My skin was extremely dry — so much so, that my knuckles were split open. They are healed and my skin is smooth as a babies bottom in just a few days. Tap water tastes like bottled water. I have more energy than I did as a teenager. I am even putting some on the wrinkles under my eyes which are fading away. I am adding a life coaching service to my website which will give me a great platform for promoting your devices. Have a great day!

  5. After hooking up the under sink unit that I purchased from you, I am convinced that what you say is true. It has empowered me to be at my best 24/7. I run a small electronics company and most days are very challenging.
    My wife of 34 years seem to have grown in different directions. I was pretty normal when we got married but she thinks I am crazy now. So I started drinking the water and she has also. WOW, now I stay full of love most of the time, and it appears to have assisted my wife also. At this point in time I would like to spread this around.
    I think I may be addicted, I get out of the shower and have to go to the basement and get some structured water. I wake up at night thirsty, I drink structured water. I love the way I feel. Honestly the water has helped me become a beacon of light 24/7.

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