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Calcium Hardness Increaser

$21.00 inc GST

BioGuard SPA Shield 450g

Raises calcium hardness to help prevent corrosion of equipment and etching of surfaces.

Frequently Bought Together

Complete spa water balance package - 10% off!

Total Price: Original price was: $85.00.Current price is: $76.50.
Save 10% when bought together

SKU: 20021813 Category: Tag: Brand:

Product Description

  • Protects spa surface and equipment.
  • Assists in maintaining calcium hardness levels.
  • Storage and transport friendly.
  • Increases calcium.
  • Helps prevent corrosion of equipment.
  • Helps prevent etching.


Water balance is important as it ensures that the mineral content of the water is in an appropriate state to protect the spa surface and equipment and make spa water more comfortable to bathe in. Water balance is affected by a wide range of variables – the quality and source of the water, what chemicals are added to the water, the exposure of the spa to weather conditions and so on. Due to the small water volume, raised water temperature and rapid agitation, chemical reactions occur much more rapidly in spas than they do in a pool environment, making water balance even more critical. A proper balance of chemical factors such as total alkalinity, pH and calcium is needed for the sanitiser to work correctly, the water to be pleasant to bathe in and to prevent scaling or corrosion of the spa surface and equipment.


  • Minimum 740g/kg calcium chloride.
  • Classified as Non-Dangerous Good*.

*Classified as Non-Dangerous Good according to the Australian Dangerous Goods Code 7.5 Edition and New Zealand standard 5433.

Additional Information

Weight .55 kg


We ship freight free for North Island orders over $169.00, and Waiheke Island and South Island orders over $269.00 (Applies only to orders under 25kg Auckland, elsewhere under 15kg.  Where applicable, RD and DG goods surcharges still apply).  Please click here for more details.


We stock quality pool and spa products and are confident that you will be very pleased with your purchase. If for any reason you are not satisfied please return it to us for a refund or exchange within 7 days of the purchase date. The refund will cover the purchase price of the returned product, including return shipping.  Please click here for more details.