--- product_id: 71459818 title: "Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer" brand: "pure pool supplies" price: "€ 7.94" currency: EUR in_stock: false reviews_count: 8 url: https://www.desertcart.hr/products/71459818-pure-pool-supplies-calcium-hardness-increaser-2-lb-calcium-up store_origin: HR region: Croatia --- # Rapid Dissolving 100% Calcium Chloride Corrosion Prevention Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer **Brand:** pure pool supplies **Price:** € 7.94 **Availability:** ❌ Out of Stock ## Summary > 🏊‍♂️ Dive into Crystal Clear Waters! ## Quick Answers - **What is this?** Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer by pure pool supplies - **How much does it cost?** € 7.94 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/71459818-pure-pool-supplies-calcium-hardness-increaser-2-lb-calcium-up) ## Best For - pure pool supplies enthusiasts ## Why This Product - Trusted pure pool supplies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Metal Guardian:** Reduces corrosion on all metal components, extending their lifespan. - • **Fast-Acting Solution:** Dissolves rapidly to deliver immediate results. - • **Elevate Your Pool Game:** Quickly raises calcium hardness levels for optimal water balance. - • **Protect Your Investment:** Prevents costly damage like etching and staining on surfaces. - • **Versatile Compatibility:** Perfect for both pools and spas, including saltwater systems. ## Overview The Pure Pool Supplies Calcium Hardness Increaser is a powerful 2 lb. solution designed to rapidly elevate calcium hardness levels in both pools and spas. Made from 100% Calcium Chloride, it effectively prevents etching, staining, and corrosion, ensuring your pool remains in pristine condition. ## Description BENEFITS Rapidly increases total hardness in pools or spas Helps reduce corrosion, etching, and stainingDIRECTIONSAlways test the water prior to using this product. Ideal hardness levels are between 150-250 ppm. Do not allow calcium hardness to fall below 100 ppm as damage to equipment and surfaces may occur. Broadcast this product in the deepest area of your pool while circulation equipment is running and the pool is not in use. Add the recommended dosage in thirds allowing 8 hours between each. Brush any undissolved clumps off of the pool surface to avoid bleaching or damage.FREQUENTLY ASKED QUESTIONSQ: Is this calcium chloride?A: Yes, this is 100% Calcium Chloride.Q: Is this for low hardness (soft water) in my pool?A: Yes, this will increase the hardness of your pool water.Q: Is this the same quality as the brands I buy in my local pool store?A: There's a good chance this is stronger and a better value. Pure Pool Supplies Hardness Increaser is 100% Calcium Chloride. Many competing brands don't list the percentage as theirs are not 100%. Q: I use bromine in my spa, will this work?A: Yes, absolutely. ## Features - RAISES calcium hardness levels rapidly and corrects problems associated with high water hardness - EFFECTIVE in both pools and spas, and is compatible with salt water pools - PREVENTS etching, staining, and pitting of concrete, gunite, or stone pool walls and decks - FAST DISSOLVING chemical made of 100% Calcium Chloride - REDUCES CORROSION of metal surfaces such as light fixtures, railings, ladders, screws, pool cover components, pool heater components, and metals in your pump or filter. Also prevents etching, pitting, and delaminating of concrete, plaster, gunite, shotcrete, and fiberglass pools ## Images ![Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer - Image 1](https://m.media-amazon.com/images/I/71UvYyscAvL.jpg) ![Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer - Image 2](https://m.media-amazon.com/images/I/81FyOqNzuSL.jpg) ![Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer - Image 3](https://m.media-amazon.com/images/I/71DMAdtH9oL.jpg) ![Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer - Image 4](https://m.media-amazon.com/images/I/71Uc4Y7NMKL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars If you get a pool replastered, you need this! *by A***R on Reviewed in the United States on July 25, 2018* I just had my pool replastered, and needed to increase hardness despite the water in my area being very hard. None of the pool supply stores around Las Vegas carry this product and this was a great find. Worked as advertised and I was careful per instructions to not add more than 5 pounds at once. Very easy to use and brought by calcium readings up instantly. Thanks Pure Pool! ### ⭐⭐⭐⭐ 4.0 out of 5 stars Worked good. *by B***E on Reviewed in the United States on March 2, 2019* This did the job of raising my calcium hardness levels in my pool. It was not the freshest as it was a bit lumpy, I had to brush the pool a few times, but it was fine. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Good value and quality. *by R***D on Reviewed in the United States on June 13, 2020* Easy to dissolve flakes. Used to increase calcium hardnesses of a spa/hot tub after a water change. Large bag so will be able to use for multiple refill's. --- ## 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.hr/products/71459818-pure-pool-supplies-calcium-hardness-increaser-2-lb-calcium-up](https://www.desertcart.hr/products/71459818-pure-pool-supplies-calcium-hardness-increaser-2-lb-calcium-up) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-17*