--- product_id: 18848519 title: "Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz" brand: "hot tub things" price: "1712940₫" currency: VND in_stock: true reviews_count: 8 url: https://www.desertcart.vn/products/18848519-calcium-increaser-liquid-spa-water-hardness-booster-for-hot-tub store_origin: VN region: Vietnam --- # Reduces foam & water cloudiness Boosts calcium hardness 80–200 ppm Protects spa equipment longevity Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz **Brand:** hot tub things **Price:** 1712940₫ **Availability:** ✅ In Stock ## Summary > 💦 Elevate your spa game—because your hot tub deserves the best soak! ## Quick Answers - **What is this?** Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz by hot tub things - **How much does it cost?** 1712940₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/18848519-calcium-increaser-liquid-spa-water-hardness-booster-for-hot-tub) ## Best For - hot tub things enthusiasts ## Why This Product - Trusted hot tub things brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Foam-Free Relaxation:** Effectively reduces foam and sanitizer demand for a cleaner, more enjoyable spa experience. - • **Crystal Clear Spa Water:** Enhances water clarity by balancing calcium levels for a pristine soak every time. - • **Universal Spa Compatibility:** Works seamlessly with chlorine, bromine, saltwater, and mineral sanitizer systems. - • **Extend Your Hot Tub’s Life:** Supports pumps, heaters, and jets by maintaining optimal mineral hardness. - • **Effortless Weekly Maintenance:** Simple dosing formula keeps your spa balanced with minimal effort—just 1 oz per 500 gallons. ## Overview This 32 oz liquid Calcium Increaser precisely boosts spa water hardness to the ideal 80–200 ppm range, protecting your hot tub’s equipment and enhancing water clarity. Compatible with all major sanitizer systems, it reduces foam and cloudiness while simplifying maintenance with easy dosing. Keep your spa sparkling and your investment lasting season after season. ## Description Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz ## Features - MAINTAINS OPTIMAL CALCIUM HARDNESS: – Boosts calcium hardness in hot tub and spa water to ideal 80–200 ppm range. This calcium hardness increaser for hot tub helps protect surfaces, jets, and heaters while improving sanitizer efficiency and water clarity. - ENHANCES EQUIPMENT DURABILITY & FUNCTION: Soft or low-calcium water can shorten spa equipment life. Our liquid calcium hardness increaser helps maintain proper mineral levels to support heaters, pumps, jets, and metallic parts in hot tubs and saltwater spas. - REDUCES FOAM AND CLOUDINESS: – High water hardness supports cleaner, clearer spa water. This spa calcium hardness increaser helps reduce sanitizer demand, prevents hazy water, and works with chlorine, bromine, and mineral-based spa care systems. - EASY DOSING & MAINTENANCE: – With pump running, add 1 fl oz per 500 gallons to raise calcium hardness about 10 ppm. Wait 2 hours and retest, repeating at half dose if needed. Use weekly or after draining to maintain optimal spa water hardness balance. - RELIABLE SPA FORMULA & SYSTEM COMPATIBLE: – Designed specifically for spas and hot tubs, this calcium hardness increaser works seamlessly with chlorine, bromine, saltwater, and mineral sanitizer systems. Made without fillers for clean, effective water hardness control. ## Product Details - **Brand:** Hot Tub Things - **Item Weight:** 2.1 Pounds - **Item Form:** Liquid - **Product Benefits:** Protects hot tub from corrosion caused by low calcium - **UPC:** 850511004222 ## Images ![Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz - Image 1](https://m.media-amazon.com/images/I/61tE3eWN0hL.jpg) ![Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz - Image 2](https://m.media-amazon.com/images/I/81TyVrrQFPL.jpg) ![Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz - Image 3](https://m.media-amazon.com/images/I/71fJsaI6ObL.jpg) ![Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz - Image 4](https://m.media-amazon.com/images/I/91zYYuHGHrL.jpg) ![Calcium Increaser, Liquid Spa Water Hardness Booster for Hot Tub & Spa, Supports Equipment Longevity, Enhances Water Balance, Reduces Foam, Salt System Compatible, 32 oz - Image 5](https://m.media-amazon.com/images/I/81MmrU2GlrL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good value, great quality *by L***O on January 11, 2020* Seems to help my other chems work more efficiently. I tried another brand but had to use way more to get to the same levels. Leads me to believe that there are clear quality and concentration differences among the various companies that sell this stuff. I highly recommend it. ### ⭐⭐⭐⭐⭐ Great quality and value *by M***E on March 4, 2019* Hot Tub Things products are great. They cost less than most retail store options and are excellent quality. They keep my hot tub clean and safe! ### ⭐⭐⭐⭐⭐ Hot tub calcium *by M***W on January 31, 2019* Use this in our hot tub. Great product great service. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/18848519-calcium-increaser-liquid-spa-water-hardness-booster-for-hot-tub](https://www.desertcart.vn/products/18848519-calcium-increaser-liquid-spa-water-hardness-booster-for-hot-tub) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-04-25*