{"product_id":"robelle-pool-calcium-up-granular-calcium-chloride-25-lb-fast-dissolving-hardness-increaser-usa-made-for-stable-pool-chemistry","title":"Robelle Pool Calcium Up granular calcium chloride 25 lb — fast-dissolving hardness increaser, USA-made for stable pool chemistry","description":"\u003cp\u003e\u003cstrong\u003eRobelle 25-Pounds Premium Pool Calcium Up is a granular calcium chloride treatment designed to raise and stabilize total hardness in swimming pools to recommended levels.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eKeeping pool calcium hardness within the correct range protects finishes, prevents corrosion and keeps water chemistry balanced. Robelle Premium Pool Calcium Up is a dry, fast-dissolving calcium chloride product made in the USA that lets pool owners precisely increase hardness when test kits show low calcium levels. Use it with your regular testing routine and follow dilution and dosing guidance for safe, even distribution.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Robelle Calcium Up correct low calcium hardness?\u003c\/h3\u003e\n\u003cp\u003eThe product is a concentrated granular calcium chloride formulated to raise total hardness when added to pool water. It dissolves quickly when pre-mixed in a bucket of pool water, producing a clear solution you can safely pour around the pool perimeter while the pump runs for even circulation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdd to a plastic bucket filled with pool water — up to 2 pounds of product per 5-gallon bucket.\u003c\/li\u003e\n  \u003cli\u003eFor a 10,000-gallon pool, limit additions to 10 pounds per 2-hour period to avoid localized over-concentration.\u003c\/li\u003e\n  \u003cli\u003eAlways run the circulation system while adding the solution for uniform distribution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat calcium hardness levels should I aim for in different pool surfaces?\u003c\/h3\u003e\n\u003cp\u003eTarget ranges vary with pool finish because each surface reacts differently to mineral content. Use a reliable calcium hardness test kit and adjust the dose until your pool is within the recommended range for your surface type.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVinyl pools: aim for 200–300 ppm to protect liners from distortion.\u003c\/li\u003e\n  \u003cli\u003eTile and exposed aggregate: aim for 200–400 ppm to avoid staining and etching.\u003c\/li\u003e\n  \u003cli\u003eMarcite, fiberglass, painted surfaces: aim for 250–400 ppm to preserve finishes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I apply Robelle Calcium Up safely and effectively?\u003c\/h3\u003e\n\u003cp\u003ePre-dissolving in water prevents concentrated granules from contacting pool surfaces and reduces cloudiness. Use plastic containers only, add gradually, and pour the solution slowly around the pool while the pump runs to ensure even mixing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-fill a plastic bucket with pool water before adding the calcium chloride.\u003c\/li\u003e\n  \u003cli\u003eUse up to 2 lb of product per ~5-gallon bucket; stir until dissolved.\u003c\/li\u003e\n  \u003cli\u003ePour the solution slowly around the pool perimeter with the filter operating.\u003c\/li\u003e\n  \u003cli\u003eWait and retest hardness after circulation before adding more; follow the maximum rate limits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this affect other water chemistry or require special precautions?\u003c\/h3\u003e\n\u003cp\u003eRaising calcium hardness can influence saturation index and other balancing steps, so retest pH, alkalinity and hardness after treatment. Avoid adding large amounts at once; incremental dosing helps maintain overall balance and prevents scaling or cloudiness.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRetest pH and alkalinity after adjusting hardness and correct if needed.\u003c\/li\u003e\n  \u003cli\u003eDo not exceed recommended per-period additions for your pool size.\u003c\/li\u003e\n  \u003cli\u003eStore product dry and sealed; keep away from moisture and incompatible materials.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Robelle 25-Pounds Premium Pool Calcium Up is intended for pool owners, service professionals and maintenance crews who need a reliable, made-in-USA calcium source to raise total hardness. It’s suited for vinyl, tile, exposed aggregate, marcite, fiberglass and painted pools when testing shows calcium is below the recommended range. Follow testing, dilution and dosing instructions to maintain balanced water chemistry and protect pool surfaces.\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: How much Robelle Calcium Up raises hardness?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: 8 ounces raises calcium hardness about 10 ppm per 5,000 gallons; adjust by pool volume and test.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I add the product directly to the pool?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — pre-dissolve in a plastic bucket of pool water and pour slowly while the pump runs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Robelle","offers":[{"title":"Default Title","offer_id":56834285142356,"sku":"B0CWVR82PT","price":135.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/robelle-front-package-25lb.jpg?v=1787048663","url":"https:\/\/gardenluxe.co.uk\/products\/robelle-pool-calcium-up-granular-calcium-chloride-25-lb-fast-dissolving-hardness-increaser-usa-made-for-stable-pool-chemistry","provider":"Gardenluxe Uk","version":"1.0","type":"link"}