--- product_id: 304008377 title: "- AquaDoc Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs" brand: "mav aquadoc" price: "163.82 DT" currency: TND in_stock: true reviews_count: 10 category: "Mav Aqua Doc" url: https://www.desertcart.tn/products/304008377-aquadoc-spa-calcium-hardness-increaser-hot-tub-owners-rely-on store_origin: TN region: Tunisia --- # Raises calcium by 10ppm per oz Easy 4-step application Prevents corrosion & etching - AquaDoc Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs **Brand:** mav aquadoc **Price:** 163.82 DT **Availability:** βœ… In Stock ## Summary > πŸ’¦ Elevate your soak gameβ€”because your hot tub deserves pro-level care! ## Quick Answers - **What is this?** - AquaDoc Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs by mav aquadoc - **How much does it cost?** 163.82 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/304008377-aquadoc-spa-calcium-hardness-increaser-hot-tub-owners-rely-on) ## 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 - β€’ **Corrosion Defense:** Protect your hot tub from costly damage like corrosion, etching, and staining with professional-grade formula. - β€’ **Effortless Maintenance:** Simple 4-step process ensures hassle-free water balancing even for busy professionals. - β€’ **Made in the USA Quality:** Crafted with care and rigorously tested to deliver consistent, reliable results every time. - β€’ **Precision Calcium Boost:** Increase water hardness in precise 10ppm increments for perfectly balanced spa water. - β€’ **Trusted by Hot Tub Enthusiasts:** Join thousands of satisfied users who rely on AquaDoc for crystal-clear, safe spa water. ## Overview AquaDoc Spa Calcium Hardness Increaser is a professional-grade granular formula designed to raise calcium levels in hot tubs by 10ppm per ounce, preventing corrosion, etching, and staining. Easy to use with a simple 4-step process, it ensures balanced, crystal-clear water and is trusted by thousands of hot tub owners. Made in the USA and highly rated, it’s the essential spa chemical for maintaining optimal water hardness and prolonging your hot tub’s life. ## Description Professional Grade We fix your water balance headaches by arming you with the spa chemicals you need to fix your everyday hot tub maintenance issues. How did we get our start? After struggling with our own pool & hot tub maintenance for years, we realized there was a shortage of quality chemicals on the market. After rigorous testing, we launched our lineup of pro-grade chemicals to help solve your hot-tub related headaches. Why do we love what we do? There's nothing better than seeing our community of happy hot tubbers enjoy their leisure time soaking in the tub. Hot tubs are amazing at bringing friends, family, and relationships together. What's our favorite time to hot tub? There's no better hot tub time than the weekend! How did we get our start? After struggling with our own pool & hot tub maintenance for years, we realized there was a shortage of quality chemicals on the market. After rigorous testing, we launched our lineup of pro-grade chemicals to help solve your hot-tub related headaches. Why do we love what we do? There's nothing better than seeing our community of happy hot tubbers enjoy their leisure time soaking in the tub. Hot tubs are amazing at bringing friends, family, and relationships together. What's our favorite time to hot tub? There's no better hot tub time than the weekend! Customer Favorites Visit the Store Customer Favorites Visit the Store Review: Works well - Products works great Review: Best value - Better than similar products, larger container for the money. ## 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 | #5,931 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #25 in Swimming Pool Balancers | | Brand | MAV AquaDoc | | Brand Name | MAV AquaDoc | | Customer Reviews | 4.7 out of 5 stars 678 Reviews | | Item Form | Granular | | Item Weight | 14 Ounces | | Manufacturer | MAV AquaDoc | | Number of Items | 1 | | Product Benefits | Corrosion | | UPC | 850026022131 | | Unit Count | 14.0 Fluid Ounces | ## Product Details - **Brand:** MAV AquaDoc - **Item Weight:** 14 Ounces - **Item Form:** Granular - **Product Benefits:** Corrosion - **UPC:** 850026022131 ## Images ![- AquaDoc Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs - Image 1](https://m.media-amazon.com/images/I/71JSnaWpnUL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well *by D***S on April 3, 2026* Products works great ### ⭐⭐⭐⭐⭐ Best value *by D***E on April 20, 2026* Better than similar products, larger container for the money. ### ⭐⭐⭐⭐⭐ Great for my spa *by A***N on February 16, 2026* I have bought this product several times because my hot tub requires it. Seems to work really well. ## 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? - 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.tn/products/304008377-aquadoc-spa-calcium-hardness-increaser-hot-tub-owners-rely-on](https://www.desertcart.tn/products/304008377-aquadoc-spa-calcium-hardness-increaser-hot-tub-owners-rely-on) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-30*