--- product_id: 28372696 title: "Spa Calcium Hardness Increaser, 12 oz, Single Pack | Raises Calcium Hardness, Easy to Use Granular Formula, Prevents Equipment Corrosion" brand: "spaguard" price: "A$25" currency: AUD in_stock: true category: "Spa Guard" url: https://www.desertcart.com.au/products/28372696-spa-calcium-hardness-increaser-12-oz-single-pack-raises-calcium store_origin: AU region: Australia --- # Maintains optimal 200-400 ppm calcium level Raises calcium hardness by 25 ppm per tbsp Prevents corrosion & equipment damage Spa Calcium Hardness Increaser, 12 oz, Single Pack | Raises Calcium Hardness, Easy to Use Granular Formula, Prevents Equipment Corrosion **Brand:** spaguard **Price:** A$25 **Availability:** βœ… In Stock ## Summary > πŸ› Keep your spa flawlessβ€”because your relaxation deserves the best! ## Quick Answers - **What is this?** Spa Calcium Hardness Increaser, 12 oz, Single Pack | Raises Calcium Hardness, Easy to Use Granular Formula, Prevents Equipment Corrosion by spaguard - **How much does it cost?** A$25 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/28372696-spa-calcium-hardness-increaser-12-oz-single-pack-raises-calcium) ## Best For - spaguard enthusiasts ## Why This Product - Trusted spaguard brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Corrosion Defense:** Protect your spa plumbing, jets, and fixtures from costly corrosion and etching. - β€’ **Optimal Water Chemistry:** Maintains calcium hardness within the ideal 200-400 ppm range to prevent damage without scaling. - β€’ **Precision Calcium Boost:** Easily increase hardness by 25 ppm per tablespoon for perfectly balanced spa water. - β€’ **Trusted SpaGuard Quality:** Backed by industry-leading expertise and 4.7-star customer satisfaction for reliable results. - β€’ **Effortless Granular Formula:** Simple to use powder dissolves quickly, making spa maintenance hassle-free. ## Overview SpaGuard Calcium Hardness Increaser is a 12 oz granular formula designed to raise and maintain spa calcium hardness between 200-400 ppm, preventing corrosion and extending the life of spa equipment. Compatible with all major sanitizers, it delivers precise, steady calcium boosts (25 ppm per tablespoon per 100 gallons) to protect plumbing, jets, and surfaces from damage, ensuring crystal-clear, balanced water and a worry-free spa experience. ## Description SpaGuards Calcium Hardness Increaser enables spa owners to increase their calcium hardness with this easy to use granular formula. This product will boost your calcium hardness. Low levels cause extensive corrosion of plumbing, jets, fixtures, and tub surfaces. Calcium Hardness Increaser will help raise the calcium level at a steady but not create scale build-up and cloudy water. The optimal calcium hardness level is 200-400 ppm, while anything below 100 ppm will cause corrosion. Raises calcium levels. 1 tbs. per 100 gallons increases calcium hardness-25ppm Prevents corrosion of equipment due to low calcium hardness Prevents etching of plaster due to low calcium hardness. When you use BioGuard spa care products (SpaGuard or Soft Soak), you are enlisting a group of individuals whose expertise is unsurpassed in the spa and pool industry. Whose dedication to helping you achieve perfect water no matter what the individual circumstance is their number one priority. Whose sole purpose is making your spa or pool the most enjoyable and trouble-free experience that you and your family will ever have. Whose dedication to the innovation and history of new product introductions is never matched, but often imitated. This dedication to service and the relentless pursuit of perfect water is inherent in the DNA of every BioGuard dealer. ## Features - Boosts Calcium Hardness: SpaGuard's Calcium Hardness Increaser enables spa owners to increase their calcium hardness with this easy to use granular formula, which will boost your calcium hardness to above the danger zone, where low levels cause extensive corrosion of plumbing, jets, fixtures, and tub surfaces. - Keeps Optimal Calcium Level: It helps raise the calcium level steadily to the optimal calcium hardness level of 200-400 ppm, to keep the spa water from becoming corrosive to heating elements and other equipment. - Protects Spa & Equipment for Longer Life: This helps protect your hot tub against corrosion, extending the life of your equipment and hot tub surfaces. - Compatibility: Calcium Hardness Increaser is compatible with chlorine, bromine, ozone and biguanide sanitizers. - Tested and Proven Effective: SpaGuard products are known for delivering reliable results and making spa care less complex. SpaGuard carries an extensive line of spa solutions that match your unique needs. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B007ZUD2IU | | Best Sellers Rank | #1,353 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #12 in Swimming Pool Balancers | | Brand Name | SpaGuard | | Customer Reviews | 4.7 4.7 out of 5 stars (3,873) | | Item Form | Powder | | Item Weight | 12 ounces | | Manufacturer | SpaGuard | | Manufacturer Part Number | 42257BIO | | Manufacturer Warranty Description | Returns are not accepted on opened or used items and are subject to a 20% restocking fee. | | Model Number | BIO42257 | | Number of Items | 1 | | Product Benefits | Prevents Corrosion | | UPC | 017541612326 017541646123 | | Unit Count | 12 Ounce | ## Product Details - **Brand:** SpaGuard - **Item Form:** Powder - **Item Weight:** 12 ounces - **Product Benefits:** Prevents Corrosion - **UPC:** 017541612326 017541646123 ## Images ![Spa Calcium Hardness Increaser, 12 oz, Single Pack | Raises Calcium Hardness, Easy to Use Granular Formula, Prevents Equipment Corrosion - Image 1](https://m.media-amazon.com/images/I/51AXJJyBudL.jpg) ![Spa Calcium Hardness Increaser, 12 oz, Single Pack | Raises Calcium Hardness, Easy to Use Granular Formula, Prevents Equipment Corrosion - Image 2](https://m.media-amazon.com/images/I/81My5Z3nuoL.jpg) ## Available Options This product comes in different **Size** options. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.au/products/28372696-spa-calcium-hardness-increaser-12-oz-single-pack-raises-calcium](https://www.desertcart.com.au/products/28372696-spa-calcium-hardness-increaser-12-oz-single-pack-raises-calcium) --- *Product available on Desertcart Australia* *Store origin: AU* *Last updated: 2026-08-04*