AquaSpa pH Reducer 500g – Spa Chemical
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Bring Spa Water Back into Balance
AquaSpa pH Reducer is the balance-correction step in the AquaSpa chlorine-free and bromine-free spa system, used when pH and total alkalinity need to be lowered to restore more comfortable, better-managed spa water.
When balance drifts too high, water can become more difficult to manage and less pleasant to use. AquaSpa pH Reducer helps bring the water back into range, supporting a cleaner, steadier spa environment and helping the broader AquaSpa system perform as intended.
Why This Balance Step Matters
Helps lower high pH and alkalinity
Used when testing shows spa water has drifted too high and needs to be brought back into range.
Supports a more comfortable spa environment
Balanced water helps create more pleasant conditions for regular spa use.
Helps reduce scale-forming conditions
High pH and alkalinity can contribute to scale formation, so keeping them in range supports cleaner water conditions.
Supports more stable water balance
Correcting high balance helps make spa water easier to manage as part of the full AquaSpa system.
Helps limit high-balance side effects
Water that is too high can contribute to metal staining and a less comfortable bathing environment.
Supports balanced AquaSpa care
Works alongside sanitising, shock treatment, and other balancers when water needs correcting.

How It Works
AquaSpa pH Reducer lowers both pH and total alkalinity in spa and hot tub water when they rise above the recommended range. In the AquaSpa system, balanced water is important for spa comfort, water quality, and the efficient operation of the wider treatment program.
When pH and alkalinity are too high, the water can become more scale-forming, contribute to metal staining, and feel less comfortable for bathers. AquaSpa pH Reducer works as the balance-correction step, helping return the water to a more suitable operating range so the rest of the AquaSpa system can perform more effectively.
How to Use
- Test the spa water before dosing.
- Calculate the correct spa volume.
- Ensure the filtration pump is running.
- Add AquaSpa pH Reducer to the spa water at the required dose.
- Leave the cover off for at least 30 minutes after dosing.
- Retest the water before making further adjustments.
Dosage & Coverage
- Dosage: Follow directions on the product label
Important Usage Information
- Use AquaSpa pH Reducer only when testing shows pH and/or total alkalinity need to be lowered.
- Always adjust total alkalinity before adjusting pH.
- Do not add more than 25g per 1,000 litres at any one time.
- Add chemicals to water and never water to chemicals, and do not overdose.
- If adding other AquaSpa products, allow 30-minute intervals between each chemical addition.
For AquaSpa systems, pH is generally maintained at 7.2–7.6 and total alkalinity at 125–150ppm. AquaSpa pH Reducer is part of overall water balance management and does not replace sanitising, shock treatment, filtration care, or other balancing steps where required.
The AquaSpa Chlorine-Free Spa Experience
AquaSpa by Lo-Chlor offers a different way to care for spas and hot tubs, built around a chlorine-free and bromine-free system that supports healthy, sparkling water with a gentler feel.
Proudly Australian and manufactured for local spa conditions, the AquaSpa range is created for spa owners who want comfort, freshness, and simpler weekly care. It works as a complete system to help maintain a more enjoyable soaking environment without the usual harshness associated with traditional sanitising methods.
From ongoing sanitising and oxidation to water clarity, balance, and system care, AquaSpa brings each part of spa maintenance together in a way that feels easier, more comfortable, and more rewarding to live with.

Frequently Asked Questions
Why does high pH or high alkalinity matter in a spa?
Do I use AquaSpa pH Reducer all the time?
Should I adjust alkalinity or pH first?
Can AquaSpa pH Reducer replace my other AquaSpa products?
Can I add AquaSpa pH Reducer with other AquaSpa products on the same day?
How much AquaSpa pH Reducer should I add at one time?
| SKU | 52AQPR500G |
|---|---|
| GTIN | 9312113091143 |
| Barcode | 52AQPR500G |
| Brand | AquaSpa |
| Model | pH Reducer - 500g |
| Product Type | Spa Chemical |
| Shipping Type | Standard |
| Chemical Type | Balancers |
| Chemical Function | Alkalinity Down, pH Down |
| Active Constituents | Hydroxytricarballylic acid: 920g/kg minimum |
Shipping
Same-day dispatch applies to orders received by 12.00 pm (AEST) during business days. Orders received after 12.00 pm and on weekends or public holidays will be dispatched on the next business day.
Delivery fees are $19.95 flat-rate per order Australia-wide, no matter how many products are in it. Orders containing bulky items like sand filters, acoustic boxes, heat pumps, pool covers, and pool slides may incur additional fees as they require specialized carriers.
Below are the estimated time to arrival in business days once an order is shipped.
| Destination | Sydney | NSW | VIC | QLD | SA | WA/NT |
|---|---|---|---|---|---|---|
| Business Days | 1 - 2 | 2 - 4 | 2 - 4 | 2 - 4 | 3 - 4 | 5 - 6 |
Rural and remote addresses, where delivery is not provided every day, may take longer.
Returns
Satisfaction Guarantee: If you are not satisfied with a product for any reason, you are welcome to return it to us for a full refund or exchange within 30 days of the purchase date - even if you have used the product. Returns are free, and we will cover return shipping.
We take full responsibility for the safe arrival of the products that you order from us. We will replace at our expense any product that arrives faulty, damaged during transit, or is the incorrect product. Click here for details
If you have any questions about our shipping policy or our return policy, please contact us on 1300 766 619 or through our contact us form.