--- product_id: 181285259 title: "Robelle 25-Pounds Premium Pool Calcium Up | Pool Calcium Hardness Increaser, 100% Calcium Chloride, 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons" brand: "robelle" price: "1092.14 DT" currency: TND in_stock: true reviews_count: 8 category: "Robelle" url: https://www.desertcart.tn/products/181285259-robelle-25-pounds-premium-pool-calcium-up-pool-calcium-hardness store_origin: TN region: Tunisia --- # Optimizes 200-400 ppm calcium Rapid hardness boost 25 lbs premium granules Robelle 25-Pounds Premium Pool Calcium Up | Pool Calcium Hardness Increaser, 100% Calcium Chloride, 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons **Brand:** robelle **Price:** 1092.14 DT **Availability:** ✅ In Stock ## Summary > 💦 Elevate your pool’s vibe with crystal-clear confidence! ## Quick Answers - **What is this?** Robelle 25-Pounds Premium Pool Calcium Up | Pool Calcium Hardness Increaser, 100% Calcium Chloride, 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons by robelle - **How much does it cost?** 1092.14 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/181285259-robelle-25-pounds-premium-pool-calcium-up-pool-calcium-hardness) ## Best For - robelle enthusiasts ## Why This Product - Trusted robelle brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Fast-Acting Formula:** See measurable improvements in water hardness almost immediately after application. - • **Precision Calcium Control:** Easily raise pool hardness by 10 ppm per 8 oz for perfectly balanced water. - • **Safe & Simple Application:** Dissolve in water and pour around pool perimeter while circulating for hassle-free maintenance. - • **Corrosion & Etching Defense:** Protect your pool surfaces from costly damage with ideal calcium levels. - • **Tailored for Every Pool Type:** Optimized calcium ranges for vinyl, tile, fiberglass, and painted pools ensure universal compatibility. ## Overview Robelle 25-Pounds Premium Pool Calcium Up is a granular calcium chloride formula designed to rapidly increase and maintain optimal calcium hardness (200-400 ppm) in all pool types. By preventing corrosion and surface etching, it safeguards your investment while ensuring balanced, crystal-clear water. Each 8-ounce dose raises hardness by 10 ppm per 5,000 gallons, making it a precise, fast, and easy solution for professional-grade pool care. ## Description This is a dry granular product that increases the total hardness in pool water to the recommended range.Test for calcium hardness with a reliable test kit. The desired range for calcium hardness is as follows: Vinyl Pools: 200-300 ppm, Tile and Exposed Aggregate Pools: 200-400 ppm, Marcite, Fiberglass or Painted Pools: 250-400 ppm. If the calcium hardness tests less than the desired range, add this product according to the included chart. Place this product into a plastic bucket already filled with swimming pool water. Do this in a ration of up to 2 pounds of product per approximate 5-gallon bucket of water. Slowly pour this solution around the perimeter of the swimming pool while the circulating system is operating. In a 10,000 gallon pool, do not add more than 10 pounds of this product per 2 hour period. Review: For hardness issues - Improper water hardness is problematic for pool equipment, and if your issue is it's too low, this is an inexpensive fix with almost immediate results. I would recommend taking a water sample someplace that does free testing (almost every pool store) since this is one thing the at home testing steps aren't accurate on. Review: Great Product/ Great Price - It increased the Pool Calcium level at a great price ## Features - Calcium chloride for pools - Rapidly increases total hardness - Helps prevent corrosion or etching of pools - Ideal calcium hardness range 200 - 400 ppm - 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water - Prevents the staining or etching of your pool's surface - Low calcium hardness level can cause water issues ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07B81QNWS | | Best Sellers Rank | #7,195 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #48 in Swimming Pool Balancers | | Brand | Robelle | | Brand Name | Robelle | | Customer Reviews | 4.7 out of 5 stars 594 Reviews | | Global Trade Identification Number | 00034261282592 | | Included Components | Pool Calcium Increaser | | Item Form | Granular | | Item Type Name | for Pools | | Item Weight | 25 pounds | | Manufacturer | Robelle | | Manufacturer Part Number | 2825B | | Model Number | 2825B | | Number of Items | 1 | | Number of Packs | 1 | | Package Size Name | 25-Pounds | | Product Benefits | Calcium Increaser | | UPC | 034261282592 | | Unit Count | 400 Ounce | ## Product Details - **Brand:** Robelle - **Item Form:** Granular - **Item Weight:** 25 Pounds - **Product Benefits:** Calcium Increaser - **UPC:** 034261282592 ## Images ![Robelle 25-Pounds Premium Pool Calcium Up | Pool Calcium Hardness Increaser, 100% Calcium Chloride, 8 ounces raises calcium hardness level 10 ppm per 5,000 gallons - Image 1](https://m.media-amazon.com/images/I/51grRTcWHfL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ For hardness issues *by D***L on August 19, 2026* Improper water hardness is problematic for pool equipment, and if your issue is it's too low, this is an inexpensive fix with almost immediate results. I would recommend taking a water sample someplace that does free testing (almost every pool store) since this is one thing the at home testing steps aren't accurate on. ### ⭐⭐⭐⭐⭐ Great Product/ Great Price *by D***N on April 15, 2026* It increased the Pool Calcium level at a great price ### ⭐⭐⭐⭐⭐ Does the job *by S***T on June 19, 2026* It raised my calcium to where I needed it at an affordable price. I'm happy with the purchase and the ease of delivery with Amazon! ## Frequently Bought Together - Robelle 25-Pounds Premium Pool Calcium Up, Calcium Hardness Increaser - Pool Mate 7-Pounds Premium Pool Stabilizer and Conditioner, Concentrated Cyanuric Acid for Pools, Helps Chlorine Last Longer - Natural Chemistry Phosfree, 3-Liter --- ## 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/181285259-robelle-25-pounds-premium-pool-calcium-up-pool-calcium-hardness](https://www.desertcart.tn/products/181285259-robelle-25-pounds-premium-pool-calcium-up-pool-calcium-hardness) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-28*