Calcium levels affect the total water hardness in your spa pool.

Low levels of calcium can corrode metal. Too high a calcium level can cause scale formation and cloudy water.

Adding Calcium Hardener is used to increase the water hardness.

This product is brought to you by Spa Supplies, which is the Number 1 Spa Pool filter and accessories company in New Zealand.

COMPATIBLE WITH: Any fresh water Spa Pool.

IMPORTANT: If you’re unsure if this is the correct product for your Spa, please leave a question for our experts below and we’ll let you know!

RETURNS: Please make your selection carefully as Pool & Spa Superstore will not offer refunds or exchanges if this product is bought and later found to be not required or incompatible with your Spa. If you receive an incorrect or damaged product, please get in touch with Pool & Spa Superstore and we will correct the issue as promptly as possible.

We’re a Kiwi owned and operated company with over 20 years combined experience in the industry. We’re committed to only selling leading brands at the best prices alongside expert advice. If you have a question about a product, just ask us and one of our experts will provide an answer. We are the exclusive Spa parts & accessories provider for Alpine Spas - NZ’s largest Spa Pool retailer.