{"product_id":"robelle-25-pounds-premium-pool-calcium-up-calcium-hardness-increaser","title":"Robelle 25-Pounds Premium Pool Calcium Up – Calcium Hardness Increaser","description":"\u003ch2\u003eBalance Your Pool Water with Robelle Calcium Up\u003c\/h2\u003e\n\u003cp\u003eRobelle 25-Pounds Premium Pool Calcium Up is a dry granular calcium chloride product designed to raise total hardness in pool water to the recommended range. When calcium hardness runs low, water can become aggressive toward pool surfaces and equipment. This practical solution helps stabilize your water chemistry and protect surfaces over time, without abrupt changes to your routine.\u003c\/p\u003e\n\u003ch3\u003eKey benefits at a glance\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCalcium chloride for pools helps to harden water and support a stable balance.\u003c\/li\u003e\n  \u003cli\u003eRapidly increases total hardness, helping you reach the target range more efficiently.\u003c\/li\u003e\n  \u003cli\u003eSupports protection against surface etching and minor staining by maintaining proper hardness.\u003c\/li\u003e\n  \u003cli\u003eIdeal calcium hardness range varies by surface type: vinyl pools 200–300 ppm; tile or exposed aggregate 200–400 ppm; marcite, fiberglass, or painted pools 250–400 ppm.\u003c\/li\u003e\n  \u003cli\u003e8 ounces typically raises hardness by about 10 ppm for every 5,000 gallons of water.\u003c\/li\u003e\n  \u003cli\u003eUsing the product as directed helps avoid low-hardness issues that can affect surfaces and equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use Robelle Calcium Up\u003c\/h3\u003e\n\u003cp\u003eFirst, test your pool water with a reliable test kit to determine current calcium hardness. If readings are below the target range, prepare a plastic bucket: fill with pool water and add up to 2 pounds of Robelle Calcium Up per roughly 5 gallons of water. Slowly pour the solution around the pool perimeter while the circulation system runs.\u003c\/p\u003e\n\u003cp\u003eFor example, in a 10,000‑gallon pool, do not exceed 10 pounds in a two-hour dosing window. The included dosing chart provides guidance based on your pool type and current hardness levels.\u003c\/p\u003e\n\u003ch3\u003ePractical tips and considerations\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eGranular formula dissolves in water with minimal effort when mixed in a bucket first.\u003c\/li\u003e\n  \u003cli\u003eRegular testing helps maintain the appropriate range for your pool surface type.\u003c\/li\u003e\n  \u003cli\u003eMaintain a consistent dosing routine to support surface protection and overall water balance during the season.\u003c\/li\u003e\n  \u003cli\u003eStore in a cool, dry place and keep out of reach of children.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho should consider Robelle Calcium Up?\u003c\/h3\u003e\n\u003cp\u003eSuitable for vinyl, tile and exposed aggregate, marcite, fiberglass, or painted pools. Target ranges—200–300 ppm for vinyl, 200–400 ppm for tile\/exposed, and 250–400 ppm for marcite, fiberglass, or painted—can guide dosing decisions.\u003c\/p\u003e\n\u003cp\u003eRemember, this product is part of a broader pool care plan. For best results, pair it with proper filtration, regular testing, and a routine tailored to your pool type and climate.\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 Robelle 25-Pounds Premium Pool Calcium Up used for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It raises calcium hardness in pool water to help protect surfaces and maintain water balance when used per the chart.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I apply Robelle Calcium Up to my pool?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Dissolve in a bucket with water, then slowly distribute around the pool while the circulation runs; do not exceed 10 pounds per 2 hours for a 10,000 gallon pool.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Robelle","offers":[{"title":"Default Title","offer_id":48213590180084,"sku":"B07B81QNWS","price":68.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/6652\/0820\/files\/robelle-calcium-up-25lb-bag.jpg?v=1778476339","url":"https:\/\/www.cerapatiogarden.com\/products\/robelle-25-pounds-premium-pool-calcium-up-calcium-hardness-increaser","provider":"Cera Garden","version":"1.0","type":"link"}