Nanobubble Technology Explained: The Science Behind Jacuzzi’s True Water® System

If daily chemical testing is the main thing standing between you and a hot tub, there is a good reason to keep reading. Jacuzzi’s True Water® system runs on nanobubble technology to deliver a chlorine-free hot tub experience with a fraction of the usual chemical routine. It sounds futuristic, but the science behind it is grounded in research that predates the hot tub industry entirely, including a NASA-backed study on water treatment for space travel.

Here is a closer look at nanobubble technology, including what it is, where it came from, how Jacuzzi built it into a hot tub, and why it is worth a second look if you live in an area with Arizona’s intense heat and hard water.

What Is a Nanobubble?

Nanobubble technology starts with a gas bubble so small it is measured in nanometers, roughly 2,500 to 5,000 times smaller than a grain of sand, depending on the source cited. At that scale, the normal rules of bubble behavior no longer apply. A bubble from a bath toy or a fish tank aerator races to the surface and pops within seconds. A nanobubble does the opposite. Its size and internal pressure allow it to remain suspended in water for days, sometimes longer, rather than rising and disappearing.

That staying power is what makes nanobubbles useful. Because they linger in the water column rather than escaping into the air, they have far more time to interact with whatever is floating around them, including bacteria, organic residue, and biofilm clinging to pipes and jets.

Where the Nanobubble Technology Came From

Nanobubbles did not start in a hot tub lab. Municipal wastewater treatment plants and agricultural operations have used them for years to oxygenate water and improve outcomes in soil and irrigation systems, since the fine bubbles distribute oxygen more evenly than traditional aeration.

The technology recently picked up an unexpected backer. Researchers at the University of Maine have led a multi-institutional, NASA-supported investigation into whether nanobubbles could help purify water on long-duration space missions, since any system that keeps water clean without heavy chemical inputs is valuable when every ounce of cargo counts.

The Jacuzzi True Water® system was validated through a research collaboration associated with the same University of Maine nanobubble work. That is a meaningful research pedigree, though it is worth being precise about what it means. NASA did not design or endorse a hot tub product. The connection is that the underlying nanobubble science supporting True Water® was studied by some of the same researchers doing NASA-backed water treatment work, which is a different thing than a NASA seal of approval, and still a fairly rare origin story for a spa feature.

How Jacuzzi’s True Water® System Works

True Water® is Jacuzzi’s application of nanobubble technology. Inside a True Water®-equipped hot tub, a dedicated generator continuously produces oxygen-filled nanobubbles and disperses them through the water. Jacuzzi describes trillions of these bubbles circulating at any given time, scrubbing at contaminants and residue along the waterline, in the plumbing, and in spots a filter alone would miss.

The nanobubbles do most of the heavy lifting, but they are not working entirely alone. True Water® pairs the nanobubble generator with the FROG @ease system, which manages a very low, steady dose of chlorine through a self-regulating cartridge. The combination is designed to bring chlorine levels down dramatically, to a level Jacuzzi states can reach up to 99.9999% chlorine-free, while still keeping a small chemical backstop in place. That is a manufacturer’s claim rather than an independent guarantee, and it describes a low-chemical system, not a zero-chemical one.

What True Water® Feels Like

Numbers aside, the more immediate difference owners notice is sensory. Water treated with heavy chlorine or bromine tends to carry a sharp smell and can leave skin and hair feeling dry after a soak. Because True Water® needs so little added chemical, the smell and residue mostly disappear. The water looks clearer, feels softer against the skin, and does not announce itself the moment you lift the cover. That is a comfort and wellness benefit worth framing carefully. It describes how the water feels, not a medical treatment for any specific health condition.

A Low-Maintenance Hot Tub Solution For Water Care

For many hesitant buyers, this is the number that matters most. A traditional hot tub typically needs daily attention, from checking sanitizer levels to adjusting pH to staying on top of shock treatments that keep the water balanced. Jacuzzi states that True Water® cuts that down to about 15 minutes a month, mostly spent confirming levels and swapping a cartridge on a set schedule.

Less daily upkeep saves time and removes one of the biggest reasons people avoid hot tub ownership in the first place: the fear that the tub becomes another chore added to a full week, rather than a place to unwind at the end of one.

Comparing Spa Water Care Methods

Seeing water care nanobubbles next to the alternatives makes the difference easy to spot.

Why This Matters More in Scottsdale and Maricopa County

Water chemistry gets harder to manage the moment you cross into the Valley. Scottsdale and the rest of Maricopa County have notoriously hard water, and that mineral content accelerates scale buildup in jets, plumbing, and heating elements. Add in a Sonoran Desert climate where hot tub water can sit at high temperatures for months at a time, and chemical demand climbs even further, since heat speeds up chlorine breakdown and pushes owners toward more frequent dosing just to keep up.

A hot tub built on nanobubble technology that runs on a fraction of the usual chemical load is a genuinely practical fit here, not just a nice-to-have. Owners who have struggled to treat calcium hardness in spa water, or who have gone back and forth on bromine versus chlorine for their spa, often find that the lower chemical demand of True Water® sidesteps much of that seasonal frustration altogether. It is one more reason our team keeps recommending it to Scottsdale-area buyers who are tired of the weekly grind of keeping spa water clean.

Which Jacuzzi® Models Have True Water®?

True Water® is a feature Jacuzzi offers on select models within its lineup, not something built into every hot tub the brand makes. Availability changes as Jacuzzi updates its collections, so the most reliable way to find out which current models include it is to ask our team directly. We can walk you through what is available, what True Water® adds to the experience, and whether it is worth prioritizing for your backyard.

Frequently Asked Questions

What is nanobubble technology?

Nanobubble technology uses gas bubbles small enough to remain suspended in water for days rather than rising and popping within seconds. That extended time in the water allows them to interact with bacteria and residue far more effectively than standard aeration does.

Is Jacuzzi’s True Water® really chlorine-free?

Not entirely. Jacuzzi states that True Water can keep hot tub water up to 99.9999% chlorine-free by combining oxygen nanobubbles with a very low, steady dose of chlorine through the FROG @ease system. It is a low-chemical system, not a zero-chemical one.

How small are the nanobubbles in True Water®?

Jacuzzi describes them as roughly 2,500 to 5,000 times smaller than a grain of sand, small enough to remain suspended in the water for an extended period rather than rising to the surface.

Which Jacuzzi hot tubs come with True Water®?

True Water® is available on select Jacuzzi models, and which ones can change as the lineup is updated. Ask our team for the current list before you shop, so you know exactly what you are choosing between.

Talk to Our Team About True Water®

Reading about nanobubbles only gets you so far, and the models currently include True Water®, which can shift as Jacuzzi updates its lineup. Our team stays current on it and can tell you exactly what is available right now.

As the leading hot tub Jacuzzi dealer Scottsdale, AZ residents count on, and the preferred Jacuzzi dealer for Maricopa County, our Scottsdale showroom carries a wide range of Jacuzzi hot tubs, and our team can walk you through current True Water® availability, which collection fits your backyard and household, and how much time you want to spend on maintenance. Reach out to schedule a visit, and we will give you a clear picture before you buy.