Why Choosing the Right Spa Sanitiser Matters
Your spa is not the same as your pool. The water is hotter, the volume is smaller, and bather load is significantly higher relative to water volume. These factors put conventional sanitisers under considerable stress.
In addition, most sanitisers simply aren’t designed for hot water conditions. If you’ve been dealing with cloudy water, a persistent chemical smell, or skin irritation, the problem is likely not how much sanitiser you’re using. It’s which one.
This guide looks at the main spa sanitiser options for Australian spa and hot tub owners. It compares how they perform under real spa conditions and explains why PoolFlow Lithium Pro has become the preferred choice for commercial and residential spa operators across the country.
The Problem with Hot Water and Most Sanitisers
Heat is the enemy of most pool and spa sanitisers. As water temperature rises above 35 degrees Celsius, the active compounds in dichlor and bromine break down more quickly. As a result, you need to add more product more often just to maintain safe sanitiser levels.
This creates a familiar cycle: more chemical use, more frequent water changes, higher costs, and still inconsistent results. Hot water also encourages biofilm, the slimy buildup that forms in pipes and on surfaces when bacteria go unchecked.
The NSW Health guidelines for public swimming pools and spa pools make clear that effective disinfection in hot water requires products registered by the Australian Pesticides and Veterinary Medicines Authority (APVMA). However, registration alone doesn’t guarantee performance at spa temperatures. The solution isn’t to use more sanitiser. It’s to use one that’s specifically formulated for high-temperature water.
How the Main Spa Sanitisers Compare
Dichlor (Chlorine Granules)
Dichlor is the most commonly used sanitiser in Australian spas. It’s widely available, easy to find, and familiar to most spa owners. However, it contains cyanuric acid (CYA), which builds up in spa water over time.
As CYA levels rise, the chlorine becomes less effective. Consequently, you need progressively more dichlor to achieve the same sanitising result. The water ends up increasingly chemically loaded.
Furthermore, dichlor degrades faster at higher temperatures. In a 38 to 40 degree spa, its effective lifespan is much shorter than in a pool. Because of this, water changes are typically required every two to three months.
Bromine
Bromine is a common alternative to chlorine for spa use. It stays active across a wider pH range, and most people find it slightly less harsh on skin. On the other hand, bromine is slower acting than chlorine and produces its own set of disinfection byproducts.
In addition, bromine has a distinctive odour that many users find unpleasant. It’s also more expensive than dichlor. Like dichlor, it requires regular water changes, typically every two to three months.
Polyhexanide (PHMB) and Hydrogen Peroxide
Some spa owners choose these non-chlorine alternatives to avoid halogens. That said, both have significant limitations in hot water environments.
Polyhexanide does not work effectively against all bacteria at high temperatures. Hydrogen peroxide degrades quickly, requires careful handling, and doesn’t provide consistent sanitisation in a frequently used spa. For these reasons, neither is well suited to Australian conditions.
Why Lithium Pro Performs Where Others Fall Short
PoolFlow Lithium Pro is a patented liquid lithium hypochlorite sanitiser. It’s specifically developed for spa, hot tub, and swim spa use. Specifically, it’s the only liquid lithium sanitiser of its kind available in Australia.
NSW Health recommends it as the preferred sanitising agent for commercial spas. You can read more about that endorsement on the NSW Health spa pool guidelines page.
In contrast to dichlor and bromine, Lithium Pro maintains its sanitising strength at 38 to 40 degrees Celsius. In fact, it becomes more effective as water temperature rises. That’s exactly what a spa sanitiser needs to do.
For more on how this plays out in practice, see our article End of Spa Frustration: How Liquid Lithium is Making Spa Care Easier.
The Lithium Pro Advantage: What the Numbers Say
| Key Performance Comparison Water change frequency with Lithium Pro: every 6 to 12 months Water change frequency with dichlor or bromine: every 2 to 3 months Estimated water saving per spa per year: up to 4,000 litres No cyanuric acid buildup. pH neutral. No toxic byproducts. View Lithium Pro product details |
The extended water life is one of the most practical benefits for spa owners. Draining and refilling a spa isn’t just inconvenient. It also costs money and wastes water.
With Lithium Pro, most spa owners drain and refill once or twice a year. In contrast, dichlor and bromine users do it every two to three months.
For example, Adam from Atlantis Pool and Spa Service in Ballina reports that his clients’ spas now hold clear water for six months between drains instead of three. He’s also cut his chemical inventory by 40 per cent. That’s a measurable outcome from simply switching sanitiser products.
Why Lithium Pro Is Recommended for Commercial Spas
NSW Health recommends Lithium Pro as the preferred sanitising agent for commercial spas. Commercial spas face extreme bather loads and higher regulatory standards. They also have far less tolerance for inconsistent water quality. Because of this, if Lithium Pro performs at that level, it’s more than capable of handling a residential spa.
Lithium hypochlorite is pH neutral and leaves no cyanuric acid residue. As a result, water chemistry stays cleaner over time and needs fewer corrective adjustments.
If pH does need attention, AlkaBoost is a straightforward 100% sodium bicarbonate alkalinity increaser that works well alongside Lithium Pro. Furthermore, Lithium Pro produces no toxic byproducts and is gentler on spa equipment, which reduces wear on heating elements and seals.
What Spa Owners Notice First
Spa owners who switch to Lithium Pro typically report the same results:
- Water that stays clear for much longer than they’re used to
- No chlorine smell, even in a fully covered spa
- Skin that feels comfortable after soaking, not tight or irritated
- Fewer chemical adjustments between uses
- Less frequent water changes
For families with sensitive skin or young children, the skin-friendly profile is often the biggest draw. Lithium Pro contains no harsh byproducts and doesn’t produce the chemical smell that puts many people off spa use. In addition, Pure Minerals pairs well with Lithium Pro. It adds a magnesium layer for even softer, more comfortable water.
Is Lithium Pro Right for Your Spa?
If your spa sees regular use and you want clear, odour-free water without frequent drain-and-refills, Lithium Pro is worth a close look. It’s particularly well suited to:
- Spas and hot tubs operating at 35 degrees Celsius or above
- Families with sensitive skin or skin conditions
- Commercial spa operators wanting to reduce maintenance frequency and chemical costs
- Swim spas, where bather load and water volume create similar challenges to a commercial environment
- Anyone who has found traditional spa sanitisers unsatisfactory
How to Use Lithium Pro
Lithium Pro is a liquid sanitiser. That means no measuring out powder, no granules settling on surfaces, and no waiting for it to dissolve. Simply add it directly to your spa water with the pump running. It takes effect immediately.
Dosage is straightforward. Your PoolFlow stockist can advise on the correct starting dose and maintenance schedule for your specific spa volume.
Because it’s classified as a non-dangerous good, Lithium Pro is also simpler to transport and store than some traditional sanitiser products. Find your nearest stockist at poolflow.au.
| PoolFlow Lithium Pro: Available Sizes 500ml for smaller spas and initial trials 1L for regular residential use 5L for commercial operators and swim spas Australian made and owned. View product. |
Where to Find Lithium Pro
PoolFlow Lithium Pro is available through authorised stockists across Victoria, New South Wales, and Queensland. It’s stocked by pool and spa retailers, not supermarkets or hardware chains. As a result, the people selling it understand how to use it.
If your current stockist doesn’t carry it, find your nearest PoolFlow stockist or browse the full product range at poolflow.au.
The Bottom Line
There are plenty of spa sanitiser products available in Australia. Most of them will keep your spa technically safe to use. However, if you want water that stays clear for longer, a spa free from chemical odour, and a routine without constant adjustments, Lithium Pro is in a different category.
In short, it’s not about using more products. It’s about using the right one.
Find your nearest stockist at www.poolflow.au/find-a-stockist.
