Under Sink Water Structured Water System

Natural Action Home Unit Installs easily Structured Water

Promotional infographic for an under sink water filter system, showing illustrated components including an RO system, a passive system canister, and a quick-connect faucet setup with water flowing into a glass.

$599.00

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Secure the Standard. Structure the Payments. Structured hydration is not a gadget purchase. It is a long-term infrastructure decision. Shop Pay Installments allows you to implement your system now and distribute payments over time — aligning the investment with your financial rhythm. Available seamlessly at checkout.

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Vortex-Flow Technology for Your Kitchen Faucet

Better Water Starts Where You Use It Most.

From your morning glass of water to coffee, tea, and cooking, your kitchen is at the center of your daily water routine.

The Natural Action Under Sink Structured Water System (HD-9) brings our signature vortex-inspired flow-form technology directly to your kitchen faucet.

Installed beneath your sink, the HD-9 guides water through engineered internal pathways as it flows to your faucet.

No electricity. No chemicals added. No replacement structuring filters.

One Simple Upgrade. Everyday Water, the Natural Action Way.

Why Choose the HD-9 Under Sink System?

Vortex-Inspired Flow Technology — Guides water through engineered spiral-flow pathways inspired by water movement in nature.
Everyday Kitchen Convenience — Enjoy the same passive water-structuring process whenever you use the connected faucet.
Designed for Drinking & Cooking — A convenient addition to your daily drinking-water, coffee, tea, and food-preparation routine.
Works with Compatible Existing Plumbing — Installs inline beneath your sink without requiring a countertop device.
No Electricity or Batteries — Powered entirely by water flowing through the unit.
No Replacement Structuring Filters — No disposable cartridges or recurring filter purchases.
Made in the USA — Backed by a 10-Year Limited Warranty and 90-Day Satisfaction Guarantee for eligible purchases.

The Benefits of Structured Water at Your Kitchen Sink

Make Every Glass Part of a Better Water Routine.

A More Enjoyable Drinking-Water Experience

Many Natural Action customers choose structured water because they are interested in how their drinking water tastes and feels.

The HD-9 introduces vortex-inspired water movement at the point where you use water most often.

Taste and mouthfeel are subjective, and specific improvements are not guaranteed.

Support Your Daily Hydration Routine

Having convenient access to drinking water can make it easier to maintain consistent hydration habits.

With the HD-9 installed beneath your kitchen sink, water passes through the revitalizer automatically whenever you use the connected faucet.

No separate pouring device or additional preparation is required.

A Different Approach to Coffee, Tea & Cooking

Water is an essential ingredient in coffee, tea, soups, and everyday cooking.

The HD-9 lets you incorporate Natural Action's passive vortex-flow process into your kitchen routine without adding treatment chemicals or minerals.

Vortex-Inspired Water Movement

Natural waterways often exhibit spiral movement and circulating currents.

Natural Action uses this design inspiration to create engineered flow pathways that guide water through a controlled vortex-inspired process.

A Long-Term Kitchen Upgrade

Unlike disposable water-treatment accessories, the HD-9 is designed as a permanently installed, passive plumbing component.

It requires no electricity, batteries, or replacement structuring cartridges.

From Your First Glass of Water to Your Last Cup of Tea.

How the HD-9 Works

Flow, Not Force.

The HD-9 uses specially designed internal flow-form geometry to guide water through a vortex-inspired pathway.

As water passes through the unit, it follows the engineered flow channels before reaching the connected kitchen faucet.

Three Simple Steps:

Install the HD-9 inline with compatible under-sink cold-water plumbing.
Turn on your kitchen faucet as usual.
Water passes through the revitalizer automatically whenever the connected line is in use.

No electricity. No chemical additives. No replacement structuring filters.

Important: Structuring Is Not Filtration

The HD-9 is a water revitalizer, not a water filter.

It does not remove chlorine, lead, PFAS, bacteria, or other contaminants, and it does not disinfect water.

If your drinking water requires contaminant reduction, use an appropriate certified filtration system before the HD-9.

Filter First. Structure Last.

LEARN THE DIFFERENCE BETWEEN STRUCTURED AND FILTERED WATER

Installation & Compatibility

Designed for Your Kitchen.

The HD-9 installs beneath your sink on a compatible cold-water supply line.

For a typical drinking-water installation, the unit is positioned downstream of any required filtration so that water passes through the revitalizer before reaching the connected faucet.

Professional installation is recommended.

Product Specifications

Feature	Specifications
Product	Under Sink Structured Water System
Model / SKU	HD-9-US
Technology	Passive vortex-inspired flow-form engineering
Primary Application	Kitchen drinking-water and food-preparation faucet
Installation	Inline beneath sink
Connection Size	1/2-inch NPT
Water Line	Compatible cold-water line
Electricity	Not required
Replacement Structuring Filters	None
Chemicals Added	None
Contaminant Filtration	Not provided
Country of Manufacture	USA
Warranty	10-Year Limited

Installation note: Verify fitting orientation, available installation space, water pressure, and plumbing compatibility before installation. Use the manufacturer's installation instructions.

VIEW HD-9 INSTALLATION INSTRUCTIONS

Simple Care & Maintenance

The HD-9 does not require replacement structuring cartridges.

Once installed, inspect plumbing connections periodically and address any leaks or changes in flow.

Continue maintaining any separate filtration system according to its manufacturer's instructions.

Which Natural Action System Is Right for You?

From One Glass to Your Entire Home.

Already Have Reverse Osmosis?

HD-9 Post-RO Inline Structured Water System

If your kitchen uses reverse osmosis, Natural Action offers a dedicated post-RO model designed for compatible 1/4-inch quick-connect tubing.

EXPLORE THE POST-RO SYSTEM

Want Filtration and Structuring Together?

HD-9 + Multipure Aquaversa

Combine under-sink drinking-water filtration with Natural Action's passive vortex-flow technology.

The Multipure system addresses specified contaminants, while the HD-9 provides a separate water-structuring stage.

EXPLORE UNDER-SINK FILTRATION + STRUCTURING

Want Structured Water Throughout Your Home?

Whole Home Structured Water System (HD-24)

Bring Natural Action's vortex-inspired technology to compatible water outlets throughout your home.

EXPLORE WHOLE-HOME STRUCTURED WATER

Not Sure Which System Is Right for You?

Take the 60-Second Natural Action Water Assessment.

Answer a few questions about your water source, current filtration, and goals to find a recommended starting point.

TAKE THE FREE WATER ASSESSMENT

Buy with Confidence

Made in the USA

10-Year Limited Warranty

90-Day Satisfaction Guarantee

Natural Action Technical Support

Warranty and satisfaction guarantee are subject to published terms.

Frequently Asked Questions

What does the Under Sink Structured Water System do?

The HD-9 guides water through engineered vortex-inspired flow pathways as water passes through the unit before reaching the connected kitchen faucet.

What are the benefits of the HD-9 Under Sink System?

The HD-9 provides convenient, passive vortex-flow technology for everyday kitchen water use. It requires no electricity, adds no chemicals, and has no replacement structuring cartridges. Individual experiences with water taste or feel may vary.

Does the HD-9 improve the taste of drinking water?

Some customers report a difference in taste or mouthfeel. These experiences are subjective, and the HD-9 does not remove taste- or odor-causing contaminants. Use appropriate filtration if contaminant reduction is needed.

Does the HD-9 filter contaminants from water?

No. The HD-9 does not remove chlorine, lead, PFAS, bacteria, or other contaminants. It is a water-structuring device, not a drinking-water filter.

Can I use the HD-9 with an existing water filter?

Yes, when the plumbing and equipment are compatible. The HD-9 is generally installed downstream of appropriate filtration, allowing water to be filtered first and then pass through the revitalizer.

Can I install the HD-9 after a reverse osmosis system?

Natural Action offers a dedicated HD-9 Post-RO model with 1/4-inch quick-connect fittings for compatible reverse osmosis systems. Choose the model that matches your plumbing configuration.

Does the HD-9 require electricity or replacement filters?

No. The HD-9 operates through water flow and requires no electricity, batteries, or replacement structuring cartridges.

What size connections does the HD-9 use?

The HD-9-US model uses 1/2-inch NPT connections. Confirm the fitting orientation and plumbing compatibility before installation.

Is professional installation recommended?

Yes. A qualified plumber can verify the correct installation location, fitting compatibility, and leak-free connections.

Is the HD-9 covered by a warranty?

Yes. The HD-9 is backed by Natural Action's 10-Year Limited Warranty and a 90-Day Satisfaction Guarantee for eligible purchases, subject to published terms.

Better Water Starts at Your Kitchen Sink.

One Faucet. Every Glass. Natural Action.

Bring vortex-inspired flow technology into your daily kitchen routine with the Natural Action HD-9 Under Sink Structured Water System.

Add to Cart. Make Natural Action Part of Every Day.

Natural Action — It's Water, The Way Nature Intended.

If I could give 10 stars, I would

I didnt know what to expect when I had the under the sink filter fitted but within the first 6 weeks I had more sustained energy, better skin and better workouts. I drink around a gallon of water per day with combined with electrolytes, creatine, my pre-workout, protein shakes, etc, and I honestly feel I was getting so much more efficacy from them. I truly believe that allowing the filter to structure my water over my mitochondria has helped my energy levels noticeably

International Buyer Review

The customer support offered by this company has exceeded all my expectations. Top notch service and customer-centric.

This is very crucial for overseas buyers like myself as there is this worry that we do not have anyone to turn to, to resolve any issues which pop up after the purchase. I took a chance to make my previous purchases and I am glad I did.

In June, my structured water device leaked. It was 9 years old. The company immediately shipped a replacement at their cost using UPS to my country with minimal questioning. I was so thankful for their prompt and thoughtful assistance.

I will not hesitate to recommend my friends and family to shop here if they are in need of a structured water device or water filtration system. And I intend to return to shop with them in the future.

I've been structuring water now for over a year me, my cats and my plants and my small splash pool. When I first gave a bowl to my cats I tested it by putting it alongside a bowl of non-structured water. They went to the structured water bowl to drink.
I notice a difference in the taste. Structured water just tastes cleaner and more refreshing.
Another notable difference is in the structuring of my pool water. It requires much less chlorine for longer periods of time.

I ran my swimming pool for 7 months using a dedicated unit installed between the pump and filter. Using the unit ended the extreme algae growth and balancing problems that were ongoing issues over the previous 20+ years . With the unit installed, the pool water was crystal clear, soft and blue and the water proved to be self balancing. This was most evident after rainfalls, which were unusually frequentl and sometimes torrential, and our many pool parties. I added 4 gallons of household bleach (5% sodium hypochlorite) over a 3 week period of intense heat, to remove algae that was growing on the plaster walls. I.used and no other agents or devices to support the water quality.