--- product_id: 389867831 title: "Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb, White" brand: "clorox pool&spa" price: "380.28 DT" currency: TND in_stock: true reviews_count: 5 category: "Clorox Pool&Spa" url: https://www.desertcart.tn/products/389867831-clorox-pool-and-spa-12204clx-calcium-hardness-increaser-4-lb store_origin: TN region: Tunisia --- # Extends pool equipment lifespan Raises hardness by 50 ppm per 5 lbs/10,000 gal Prevents corrosion, etching & staining Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb, White **Brand:** clorox pool&spa **Price:** 380.28 DT **Availability:** ✅ In Stock ## Summary > 🛁 Keep your pool flawless and your summer endless! ## Quick Answers - **What is this?** Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb, White by clorox pool&spa - **How much does it cost?** 380.28 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/389867831-clorox-pool-and-spa-12204clx-calcium-hardness-increaser-4-lb) ## Best For - clorox pool&spa enthusiasts ## Why This Product - Trusted clorox pool&spa brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart Pool Care:** Pair with the Clorox Pool App for expert testing and personalized dosage recommendations anytime, anywhere. - • **Effortless Application:** Granular formula dissolves quickly for fast, effective treatment—no hassle, just results. - • **Ultimate Surface Shield:** Guard your plaster or vinyl pool against corrosion and unsightly stains with trusted Clorox quality. - • **Value Meets Performance:** Highly rated by thousands, delivering premium protection without the premium price tag. - • **Precision Hardness Boost:** Easily balance your pool’s calcium levels for crystal-clear water and lasting surface protection. ## Overview Clorox Pool&Spa Calcium Hardness Increaser is a granular 4 lb formula designed to raise low calcium hardness levels by 50 ppm per 5 lbs per 10,000 gallons, preventing corrosion, etching, and staining in plaster and vinyl pools. Trusted by thousands with a 4.7-star rating, it extends pool equipment life and pairs seamlessly with the Clorox Pool App for expert maintenance. ## Description Clorox Pool&Spa Calcium Hardness Increaser raises low Total Hardness levels in your swimming pool that can cause damage to your pool surface. Ideal for plaster pools & soft water areas. Use it to raise Total Hardness levels in your pool that are below 175 ppm. Increasing Total Hardness in your pool prevents surface damage like corrosion, staining, and etching. 5 lbs. per 10, 000 gallons will raise increase your Total Hardness levels by 50 ppm. Review: Protects the Vinyl Liner - I use the Clorox Calcium hardness increaser to protect our vinyl pool liner. It dissolves quickly and is effective in increasing the transparency of the water and reducing algae blooms. Review: Great value for a needed product - This hardness increase works every bit as well as the premium products from a fancy spa supply house. Name brand product, great value, easily applied and with two internal packages, useful for a good long time. I did admittedly transfer this product to a sturdy plastic canister for better moisture protection and easier storage / application. Would easily recommend and will certainly order again. ## Features - Prevents Corrosion, Etching, and Staining: With Clorox Pool&Spa Swimming Pool Calcium Hardness Increaser, you can safeguard your pool against corrosion, etching, and staining, ensuring its longevity and pristine appearance. Our product offers reliable protection, giving you peace of mind while you enjoy your pool. - Increases Low Total Hardness Levels: This product helps increase the low total hardness levels in swimming pool water, ensuring a balanced and stable environment for your pool. It restores water parameters to their ideal ranges. - Extends Equipment Life: Unbalanced water can cause a corrosive environment that damages your pool surfaces or equipment. This product prevents pool surface damage, reduces pool maintenance, extending the life of your pool's cleanliness. - Compatibility: Our Clorox Pool&Spa Swimming Pool Calcium Hardness Increaser is ideal for plaster pools and areas with soft water. - Clorox Pool App: Test like an expert anytime, anywhere with the Clorox Pool App. Solve common swimming pool problems and get personalized product and dosage recommendations. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B084GQH8YF | | Brand | CLOROX Pool&Spa | | Brand Name | CLOROX Pool&Spa | | Customer Reviews | 4.7 out of 5 stars 4,849 Reviews | | Global Trade Identification Number | 00810821023108 | | Included Components | Includes: 1 x Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb | | Item Form | Granular | | Item Type Name | Calcium Hardness Increaser, 4 lb. | | Item Weight | 4 Pounds | | Item form | Granular | | Item weight | 4 Pounds | | Manufacturer | Clorox Pool&Spa | | Manufacturer Part Number | 12204CLX | | Model Number | 12204CLX | | Number of Items | 1 | | Product Benefits | Prevents Corrosion, Prevents Staining | | Product benefits | Prevents Corrosion, Prevents Staining | | UPC | 810821023108 | | Unit Count | 64 Grams | ## Product Details - **Brand:** CLOROX Pool&Spa - **Item form:** Granular - **Item weight:** 1.81 kg - **Product benefits:** Prevents Corrosion, Prevents Staining - **UPC:** 810821023108 ## Images ![Clorox Pool&Spa 12204CLX Calcium Hardness Increaser, 4 lb, White - Image 1](https://m.media-amazon.com/images/I/71E4MrOqgkL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Protects the Vinyl Liner *by W***N on 19 May 2026* I use the Clorox Calcium hardness increaser to protect our vinyl pool liner. It dissolves quickly and is effective in increasing the transparency of the water and reducing algae blooms. ### ⭐⭐⭐⭐⭐ Great value for a needed product *by U***R on 31 May 2025* This hardness increase works every bit as well as the premium products from a fancy spa supply house. Name brand product, great value, easily applied and with two internal packages, useful for a good long time. I did admittedly transfer this product to a sturdy plastic canister for better moisture protection and easier storage / application. Would easily recommend and will certainly order again. ### ⭐⭐⭐⭐⭐ Great product *by C***E on 16 June 2025* I used this in my hot tub to harden the city water. Worked just as good as the expensive stuff from there and was bigger volume in bag verses their little bottle of it. ## Frequently Bought Together - Clorox® Pool&Spa™ Swimming Pool Calcium Hardness Increaser, Prevents Corrosion, Etching and Staining, 4LB (Pack of 1) - Clorox® Pool&Spa™ Swimming Pool Alkalinity Increaser, Keeps pH Balanced, 5LB (Pack of 1) - Clorox® Pool&Spa™ Swimming Pool Chlorine Stabilizer, Helps Chlorine Last Longer, Saltwater Pool Compatible, 4LB (Pack of 1) --- ## 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.tn/products/389867831-clorox-pool-and-spa-12204clx-calcium-hardness-increaser-4-lb](https://www.desertcart.tn/products/389867831-clorox-pool-and-spa-12204clx-calcium-hardness-increaser-4-lb) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-28*