--- product_id: 389867831 title: "12204CLX Calcium Hardness Increaser, 4 lb, White" brand: "clorox pool&spa" price: "£67.73" currency: GBP in_stock: true category: "Clorox Pool&Spa" url: https://www.desertcart.co.uk/products/389867831-12204clx-calcium-hardness-increaser-4-lb-white store_origin: GB region: United Kingdom --- # Extends pool equipment life Raises hardness by 50 ppm per 5 lbs Prevents corrosion & staining 12204CLX Calcium Hardness Increaser, 4 lb, White **Brand:** clorox pool&spa **Price:** £67.73 **Availability:** ✅ In Stock ## Summary > 🛁 Keep your pool flawless and future-proof with Clorox Calcium Hardness Increaser! ## Quick Answers - **What is this?** 12204CLX Calcium Hardness Increaser, 4 lb, White by clorox pool&spa - **How much does it cost?** £67.73 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/389867831-12204clx-calcium-hardness-increaser-4-lb-white) ## 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 - • **Precision Hardness Boost:** Easily raise calcium hardness to ideal 175+ ppm for balanced water chemistry. - • **Effortless Granular Formula:** Fast-dissolving granules that blend seamlessly for quick, hassle-free application. - • **Smart Pool Care Integration:** Pair with the Clorox Pool App for expert testing and personalized dosing anytime, anywhere. - • **Ultimate Surface Protection:** Shield your pool from corrosion, etching, and unsightly stains with every use. - • **Longevity for Your Investment:** Prolong your pool’s lifespan by maintaining optimal water hardness and preventing damage. ## Overview Clorox Pool&Spa Calcium Hardness Increaser is a granular formula designed to raise low calcium hardness levels in plaster and soft water pools by 50 ppm per 5 lbs. It prevents corrosion, etching, and staining, thereby extending the life of pool surfaces and equipment. Compatible with the Clorox Pool App, it offers a smart, easy way to maintain balanced, pristine pool water. ## 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. ## 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 Name | CLOROX Pool&Spa | | Customer Reviews | 4.7 4.7 out of 5 stars (4,964) | | 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 | | Manufacturer | Clorox Pool&Spa | | Manufacturer Part Number | 12204CLX | | Model Number | 12204CLX | | Number of Items | 1 | | Number of Packs | 1 | | Product Benefits | Prevents Corrosion, Prevents Staining | | UPC | 810821023108 | | Unit Count | 64 Grams | ## Product Details - **Brand:** CLOROX Pool&Spa - **Item form:** Granular - **Item weight:** 4 Pounds - **Product benefits:** Prevents Corrosion, Prevents Staining - **UPC:** 810821023108 ## Images ![12204CLX Calcium Hardness Increaser, 4 lb, White - Image 1](https://m.media-amazon.com/images/I/71E4MrOqgkL.jpg) ## Available Options This product comes in different **Size** options. ## 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.co.uk/products/389867831-12204clx-calcium-hardness-increaser-4-lb-white](https://www.desertcart.co.uk/products/389867831-12204clx-calcium-hardness-increaser-4-lb-white) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-10-05*