AquaSpa Calcium Hardness Enhancer 500g – Spa Chemical

Balance support that helps raise calcium hardness for more stable, comfortable, and better-protected spa water.
AquaSpa
SKU:
 
52AQCE500G
  $15.00
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AquaSpa System Guide – how the system works, how to start, and how to convert your spa or hot tub to AquaSpa.
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Returns are free, there are no fees. We also make sure returns are easy to organize and processed promptly.

Satisfaction Guarantee

We stock quality pool and spa equipment and supplies from the most renowned manufacturers in Australia and the world and we are confident that you will be very pleased with your purchase. If for any reason you are not satisfied with a product, you are welcome to return it to us for a refund or exchange within 30 days of the purchase date. The refund will be issued to the full amount paid for the product including shipping.

Terms

  • You must contact us within 30 days of the date of purchase.
  • The product must be returned in good conditions.
  • Products damaged because of incorrect use, negligence or misuse will not be accepted.
  • All components, accessories and original packaging must be returned.
  • A copy of the original receipt must be included with the return.
  • Products must be shipped or returned to our Penrith NSW warehouse using a pre-paid label we will supply.

If you have any questions about our return policy, please contact us on 1300 766 619 or through our "contact us" form.

How to return a product

For more details including the steps required to return a product click here

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Calcium Balance for Better Spa Care

AquaSpa Calcium Hardness Enhancer is the calcium-balance step in the AquaSpa chlorine-free and bromine-free spa system, used when calcium hardness needs to be raised to support more balanced, better-protected spa water.

When calcium hardness is too low, the water can become more aggressive to spa surfaces and equipment, making overall water balance harder to maintain over time. AquaSpa Calcium Hardness Enhancer helps restore the calcium level needed for steadier water conditions and more reliable day-to-day AquaSpa care.

Why This Balance Step Matters

Helps raise low calcium hardness
Used when testing shows calcium hardness has fallen below the recommended range and needs correction.

Supports better water balance
Calcium hardness is an important part of achieving more stable, better-managed spa water.

Helps protect surfaces and equipment
Water that is too low in calcium can contribute to equipment corrosion and may affect concrete and grouted spa finishes.

Supports a more comfortable spa environment
Balanced calcium hardness helps support steadier, more settled water conditions for regular spa use.

Quality formula for clearer water
Made with quality food-grade material to support calcium balance without clouding the spa.

Supports balanced AquaSpa care
Works alongside sanitising, shock treatment, and other balancers when water needs correcting.

Balance support for steadier, better-protected spa water

How It Works

AquaSpa Calcium Hardness Enhancer raises calcium hardness in spa and hot tub water using calcium chloride. In the AquaSpa system, calcium hardness is an important part of overall water balance and helps support more stable conditions in the water.

When calcium hardness is too low, the water can become more aggressive and may contribute to equipment corrosion, etching of concrete and grouted surfaces, and less settled overall balance. AquaSpa Calcium Hardness Enhancer is used to restore the calcium level so the water remains better balanced and more suitable for ongoing AquaSpa care.

How to Use

  1. Test the spa water before dosing.
  2. Calculate the correct spa volume.
  3. Ensure the filtration pump is running.
  4. Add AquaSpa Calcium Hardness Enhancer to the spa water at the required dose.
  5. Leave the cover off for at least 30 minutes after dosing.
  6. Retest the water before making further adjustments.

Dosage & Coverage

  • Dosage: To raise calcium hardness by 10ppm, add 10g per 1,000 litres

Important Usage Information

  • Use AquaSpa Calcium Hardness Enhancer only when testing shows calcium hardness needs to be raised.
  • Test the water before adding and retest after circulation before making further adjustments.
  • 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.

Calcium hardness should generally be maintained between 200–275ppm for concrete and tiled spas and hot tubs, and between 175–225ppm for other surfaces. AquaSpa Calcium Hardness Enhancer 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.

AquaSpa by Lo-Chlor – chlorine-free comfort for a fresher spa experience

Frequently Asked Questions

When should I use AquaSpa Calcium Hardness Enhancer?
Use it when testing shows calcium hardness in your spa or hot tub is too low and needs to be brought back into range.
Why does low calcium hardness matter in a spa?
Water that is too low in calcium can become more aggressive, which may contribute to equipment corrosion and may affect concrete and grouted spa surfaces over time.
Do I need to test the water before adding AquaSpa Calcium Hardness Enhancer?
Yes. AquaSpa Calcium Hardness Enhancer should be added only after testing confirms that calcium hardness is below the recommended range.
What calcium hardness level should I aim for?
Calcium hardness should generally be maintained between 200–275ppm for concrete and tiled spas and hot tubs, and between 175–225ppm for other surfaces.
Can low calcium hardness affect spa surfaces or equipment?
Yes. Low calcium hardness can contribute to equipment corrosion and may etch concrete and grouted spa finishes if it is left uncorrected.
Can I add AquaSpa Calcium Hardness Enhancer with other AquaSpa products on the same day?
Yes. Keep the filtration pump running, leave the cover off, and allow 30-minute intervals between each chemical addition.
SKU 52AQCE500G
GTIN 9312113091112
Barcode 52AQCE500G
Brand AquaSpa
Model Calcium Enhancer - 500g
Product Type Spa Chemical
Shipping Type Standard
Chemical Type Balancers
Chemical Function Calcium Up
Active Constituents Calcium chloride: 740g/kg minimum
AquaSpa Balancers & Adjusters - Brochure AquaSpa Balancers & Adjusters - Brochure (140.40 kB)
AquaSpa Calcium Enhancer - Safety Data Sheet AquaSpa Calcium Enhancer - Safety Data Sheet (294.85 kB)
AquaSpa Dosage Chart AquaSpa Dosage Chart (36.55 kB)

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.

AquaSpa Maintenance & Troubleshooting Support

AquaSpa is designed to make weekly spa care feel simpler, cleaner, and easier to stay on top of.

For weekly care guidance, water balance targets, filter cleaning, drain and refill timing, and help with common water issues, see the AquaSpa Maintenance & Troubleshooting Guide .