{"product_id":"robelle-calcium-hardness-increaser-25-lb-rapid-pool-calcium-up","title":"Robelle Calcium Hardness Increaser 25 lb - Rapid Pool Calcium Up","description":"\u003cp\u003eIn this review the Robelle 25-Pounds Premium Pool Calcium Up is assessed for pool owners who need a reliable way to raise calcium hardness without guesswork. The bottom line: it is a straightforward, granular \u003cstrong\u003ecalcium hardness increaser\u003c\/strong\u003e that dissolves easily and rapidly increases total hardness to help prevent corrosion, staining, and etching. For those who test their water and find calcium below the recommended range, this product offers an effective, budget-friendly way to bring levels into the ideal 200-400 ppm window.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapidly raises hardness:\u003c\/strong\u003e The calcium chloride formula quickly increases total hardness so pool surfaces are protected from etching and corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured dosing:\u003c\/strong\u003e 8 ounces raises calcium hardness about 10 ppm per 5,000 gallons, which makes it easy to calculate additions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface protection:\u003c\/strong\u003e Keeping calcium in the recommended range helps prevent staining and etching of vinyl, tile, marcite, fiberglass, and painted finishes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear instructions:\u003c\/strong\u003e The product is intended to be dissolved in a bucket and added around the pool perimeter while circulating, simplifying application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge quantity:\u003c\/strong\u003e The 25-pound package supplies multiple treatments for mid-size pools, making it cost-effective for recurring maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is best for residential pool owners and maintenance professionals who routinely test water and need to raise calcium hardness into the recommended ranges: 200-300 ppm for vinyl, 200-400 ppm for tile and exposed aggregate, and 250-400 ppm for marcite, fiberglass, or painted pools. It suits anyone who prefers to add a measured chemical rather than rely on guesswork.\u003c\/p\u003e\n\u003cp\u003eIt is not aimed at users who avoid manual chemical handling or who have extremely small paddling pools where such dosing precision is unnecessary. Those uncomfortable with dissolving granular chemicals in a bucket should seek professional service or pre-mixed alternatives.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGood value for money for a 25 lb supply that treats multiple adjustments.\u003c\/li\u003e\n\u003cli\u003eDissolves easily and is simple to apply when following the included chart and bucket method.\u003c\/li\u003e\n\u003cli\u003eEffectively balances calcium hardness to help prevent corrosion and staining of pool surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe granular form requires pre-dissolving and careful handling; not as convenient as ready-to-use liquids for some users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eCalcium chloride granular hardness increaser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e25 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDosing guideline\u003c\/td\u003e\n\u003ctd\u003e8 oz raises calcium hardness 10 ppm per 5,000 gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum single add\u003c\/td\u003e\n\u003ctd\u003eDo not add more than 10 pounds at once to a 10,000 gallon pool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication method\u003c\/td\u003e\n\u003ctd\u003eDissolve in plastic bucket of pool water then pour around pool while circulating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended calcium range\u003c\/td\u003e\n\u003ctd\u003eVinyl 200-300 ppm; Tile\/Aggregate 200-400 ppm; Marcite\/Fiberglass\/Painted 250-400 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Robelle 25-Pounds Calcium Hardness Increaser is a practical and cost-effective choice for pool owners who test water and want to maintain proper hardness to protect surfaces. It dissolves and applies simply, with clear dosing guidance, and is particularly good value for routine maintenance and occasional corrections to keep pools in the recommended 200-400 ppm range.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow much will this raise calcium in my pool?\u003c\/strong\u003e\u003cbr\u003e8 ounces raises calcium hardness about 10 ppm for each 5,000 gallons of pool water; use the included chart to scale doses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow should I add it to the pool?\u003c\/strong\u003e\u003cbr\u003eDissolve the granular product in a plastic bucket of pool water (up to about 2 lb per 5-gallon bucket) and slowly pour the solution around the perimeter while the circulation pump runs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the safe calcium range to aim for?\u003c\/strong\u003e\u003cbr\u003eAim for 200-300 ppm for vinyl pools, 200-400 ppm for tile and exposed aggregate, and 250-400 ppm for marcite, fiberglass, or painted pools.\u003c\/p\u003e","brand":"Robelle","offers":[{"title":"Default Title","offer_id":48642608759003,"sku":"B07B81QNWS","price":42.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51grRTcWHfL._AC_SL1000.jpg?v=1778730495","url":"https:\/\/gearmusthave.com\/products\/robelle-calcium-hardness-increaser-25-lb-rapid-pool-calcium-up","provider":"GearMustHave","version":"1.0","type":"link"}