--- product_id: 304008377 title: "AquaDoc Spa Calcium Hardness Increaser for Hot Tubs - 14 oz" brand: "mav aquadoc" price: "R932" currency: ZAR in_stock: true category: "Mav Aqua Doc" url: https://www.desertcart.co.za/products/304008377-aquadoc-spa-calcium-hardness-increaser-for-hot-tubs-14-oz store_origin: ZA region: South Africa --- # Boosts calcium by 10ppm per oz Prevents corrosion & staining Made in USA, professional grade AquaDoc Spa Calcium Hardness Increaser for Hot Tubs - 14 oz **Brand:** mav aquadoc **Price:** R932 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your spa game—because balanced water means blissful soak sessions! ## Quick Answers - **What is this?** AquaDoc Spa Calcium Hardness Increaser for Hot Tubs - 14 oz by mav aquadoc - **How much does it cost?** R932 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/304008377-aquadoc-spa-calcium-hardness-increaser-for-hot-tubs-14-oz) ## Best For - mav aquadoc enthusiasts ## Why This Product - Trusted mav aquadoc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Spa Owner’s Must-Have:** Join thousands of satisfied users who keep their tubs pristine and inviting year-round. - • **Precision Calcium Control:** Easily raise hardness levels in 10ppm increments for perfectly balanced spa water. - • **Trusted Professional Grade:** Formulated for spa owners who demand reliable, high-quality water care made in the USA. - • **Ultimate Protection Formula:** Defend your hot tub from corrosion, etching, and unsightly stains with every use. - • **Simple & Effective Application:** Just measure, add, and filter—maintain crystal-clear water without hassle or guesswork. ## Overview AquaDoc Spa Calcium Hardness Increaser is a 14 oz granular formula designed to raise calcium levels in hot tubs by 10ppm per ounce, preventing corrosion, etching, and staining. Made in the USA, this professional-grade product ensures balanced, crystal-clear water with easy application, making it an essential chemical for maintaining optimal spa water quality. ## Description desertcart.com: AquaDoc Spa Calcium Hardness Increaser for Hot Tubs - 14 oz | Calcium Chlorine Granules to Help Boost Calcium Levels for Balanced Water - Hot Tub Chemicals Made in USA : Patio, Lawn & Garden ## Features - Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser. Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. AquaDoc's Calcium Booster gets your hardness up. - Avoid corrosion, etching, and staining - AquaDoc's Professional Grade Hot Tub Calcium increaser is your best defense against soft water in your hot tub or spa. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs. - How it works - AquaDoc's Hot Tub Calcium hardness Increaser works to raise your water's hardness level to ensure properly balanced hot tub water. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more. - The Hardness Increaser Hot Tub Owners Love - When it comes to Spa Chemicals calcium hardness increaser is a must have. Without hot tub chemicals calcium hardness can become unbalanced. Always have a hot tub calcium booster ready and waiting. - Easy to Use, Made in the USA - (1) Check your calcium levels, (2) 1 ounce of AquaDoc's Calcium increaser will boost water's hardness level by 10ppm. (3) After determining hardness level goal, add proper amount of increaser while equipment is on. (4) Run filter for 1 - 2 hours, wait 20 minutes, then retest water. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08TGTHK9Q | | Best Sellers Rank | #4,548 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #34 in Swimming Pool Balancers | | Brand Name | MAV AquaDoc | | Customer Reviews | 4.7 4.7 out of 5 stars (720) | | Item Form | Granular | | Item Weight | 14 ounces | | Manufacturer | MAV AquaDoc | | Manufacturer Part Number | CLINC | | Model Number | CLINC | | Number of Items | 1 | | Product Benefits | Corrosion | | UPC | 850026022131 | | Unit Count | 14 Fluid Ounces | ## Product Details - **Brand:** MAV AquaDoc - **Item Form:** Granular - **Item Weight:** 14 ounces - **Product Benefits:** Corrosion - **UPC:** 850026022131 ## Images ![AquaDoc Spa Calcium Hardness Increaser for Hot Tubs - 14 oz - Image 1](https://m.media-amazon.com/images/I/71JSnaWpnUL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - MAV AquaDoc Calcium Hardness Increaser Hot Tub Owners Rely On, Calcium Booster for Hot Tubs & Spas - AquaDoc Total Alkalinity Increaser for Hot Tub - Alkalinity Booster for Spas & Fresh Water pH Balance - Non-Chlorine Spa Shock for Hot tub - Chlorine Free Tub Treatment & Enhanced to Assist Bromine Suitable Oxidizer Oxidizing by AquaDoc --- ## 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.co.za/products/304008377-aquadoc-spa-calcium-hardness-increaser-for-hot-tubs-14-oz](https://www.desertcart.co.za/products/304008377-aquadoc-spa-calcium-hardness-increaser-for-hot-tubs-14-oz) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-08-29*