{"product_id":"pool-mate-25-pounds-premium-calcium-hardness-increaser-for-pools-100-calcium-chloride","title":"Pool Mate 25-Pounds Premium Calcium Hardness Increaser for Pools – 100% Calcium Chloride","description":"\u003cp\u003eMaintain balanced pool water by increasing calcium hardness with Pool Mate 25-Pounds Premium Calcium Hardness Increaser. This dry, granulated formula uses pure calcium chloride to raise total hardness and support a stable, comfortable swimming experience. Use with a trusted test kit to determine the right target for your pool surface type and to guide dosing.\u003c\/p\u003e\n\u003ch2\u003eWhy calcium hardness matters\u003c\/h2\u003e\n\u003cp\u003eCalcium hardness helps protect your pool surfaces from corrosion and etching by maintaining the mineral balance. Depending on your surface—vinyl, tile, plaster, fiberglass—the recommended range varies. With Pool Mate, you can aim for the appropriate range and monitor changes via test measurements.\u003c\/p\u003e\n\u003ch2\u003eWhat you get and how it works\u003c\/h2\u003e\n\u003cp\u003eThis product is designed for quick, visible changes in hardness. A little goes a long way: 8 ounces raise hardness by about 10 ppm in roughly 5,000 gallons. The included dosing guidance shows how to apply in steps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCalcium chloride for pools\u003c\/li\u003e\n  \u003cli\u003eRapidly increases total hardness\u003c\/li\u003e\n  \u003cli\u003eHelps prevent corrosion or etching of pools\u003c\/li\u003e\n  \u003cli\u003eIdeal calcium hardness range 200 - 400 ppm\u003c\/li\u003e\n  \u003cli\u003e8 ounces raises calcium hardness level 10 ppm per 5,000 gallons of water\u003c\/li\u003e\n  \u003cli\u003ePrevents the staining or etching of your pool's surface\u003c\/li\u003e\n  \u003cli\u003eLow calcium hardness level can cause water issues\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eUsage guidance and real-world tips\u003c\/h2\u003e\n\u003cp\u003eFollow the included chart and use a bucket method for safe mixing. Steps typically include dissolving the product in a bucket of pool water and distributing the solution around the pool while the circulation system runs. For larger pools, pace the dosing to avoid rapid shifts. In a 10,000 gallon pool, avoid adding more than 10 pounds in a two-hour window.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTest water first with a reliable kit\u003c\/li\u003e\n  \u003cli\u003ePlace the product in a bucket of pool water\u003c\/li\u003e\n  \u003cli\u003ePour slowly around the pool perimeter with the pump on\u003c\/li\u003e\n  \u003cli\u003eLimit dosing to 10 pounds per 2 hours in a 10,000 gallon pool\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBy staying within target ranges, you may help support a balanced environment that feels comfortable for swimmers while maintaining surface integrity. This is a dry granular product designed for easy storage and careful use as part of routine pool maintenance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is Pool Mate 25-Pounds Premium Calcium Hardness Increaser used for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It raises total calcium hardness in pool water to the recommended ranges for different surface types, following the included chart and test kit results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How much Pool Mate should I use for a large pool?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: For a 10,000 gallon pool, do not exceed 10 pounds per 2-hour period; mix in a bucket and slowly distribute around the pool while the circulation runs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Pool Mate","offers":[{"title":"Default Title","offer_id":48213590016244,"sku":"B07B7ZBCXQ","price":68.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/6652\/0820\/files\/pool-mate-calcium-hardness-bottle.jpg?v=1778476339","url":"https:\/\/www.cerapatiogarden.com\/products\/pool-mate-25-pounds-premium-calcium-hardness-increaser-for-pools-100-calcium-chloride","provider":"Cera Garden","version":"1.0","type":"link"}