{"product_id":"robelle-16-pound-premium-pool-calcium-up-calcium-hardness-increaser","title":"Robelle 16-Pound Premium Pool Calcium Up — Calcium Hardness Increaser","description":"\u003cp\u003eRobelle 16-Pound Premium Pool Calcium Up is a dry granular formula designed to raise calcium hardness in pool water. By lifting the total hardness, it supports a stable balance that helps protect surfaces and equipment as water circulates.\u003c\/p\u003e\n\u003cp\u003eChoosing the right hardness helps in different pool types. For vinyl pools, the recommended range is 200 to 300 ppm, while tile and exposed aggregate swim areas often sit between 200 and 400 ppm. Marcite, fiberglass, or painted surfaces typically operate best around 250 to 400 ppm. Regular testing with a trusted test kit guides when a treatment is needed.\u003c\/p\u003e\n\u003ch3\u003eKey benefits you may notice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRapidly increases total hardness when added as directed\u003c\/li\u003e\n\u003cli\u003eHelps prevent corrosion or etching of pool surfaces when hardness is within the target range\u003c\/li\u003e\n\u003cli\u003eSupports the ideal calcium hardness range of about 200 to 400 ppm across common pool types\u003c\/li\u003e\n\u003cli\u003eEight ounces of the product can raise hardness by about 10 ppm in a 5,000 gallon volume\u003c\/li\u003e\n\u003cli\u003ePreventing staining and surface wear is associated with balanced hardness\u003c\/li\u003e\n\u003cli\u003eAddresses typical issues that occur when calcium hardness is too low\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use and dosing guidance\u003c\/h3\u003e\n\u003cp\u003eBegin with a reliable water test to confirm the current calcium hardness. If the result is below the target range, prepare a solution by placing up to 2 pounds of the product into a plastic bucket filled with pool water. Slowly pour the solution around the pool perimeter while the circulation system operates.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIn a 10,000 gallon pool, do not add more than 10 pounds during any 2 hour period\u003c\/li\u003e\n\u003cli\u003eFollow the included chart to match quantity to your pool size and current levels\u003c\/li\u003e\n\u003cli\u003eDisperse gradually to avoid localized concentrations and ensure even distribution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn day to day use, homeowners notice smoother water balance after a routine check and adjust. The product works best when used as part of regular water testing and maintenance, and it is compatible with standard circulating systems.\u003c\/p\u003e\n\u003cp\u003eNote that this product is intended as a water treatment aid and is not a guarantee of results. Benefits occur as part of maintaining balanced hardness when used as directed.\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 16-Pounds Premium Pool Calcium Up used for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It raises calcium hardness in pool water to the recommended range when used as directed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How should I apply this product?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Mix up to 2 lb per 5 gal of water, then pour slowly around the pool with circulation; avoid more than 10 lb per 10,000 gal in a 2-hour window.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Robelle","offers":[{"title":"Default Title","offer_id":48206991163636,"sku":"B01CP5S590","price":35.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/6652\/0820\/files\/robelle-calcium-up-bottle-pour.jpg?v=1778424615","url":"https:\/\/www.cerapatiogarden.com\/products\/robelle-16-pound-premium-pool-calcium-up-calcium-hardness-increaser","provider":"Cera Garden","version":"1.0","type":"link"}