{"product_id":"pool-calcium-hardness-increaser-robelle-8-lb-calcium-up","title":"Pool Calcium Hardness Increaser - Robelle 8 lb Calcium Up","description":"\u003cp\u003eIn this review the Robelle 8-Pounds Premium Pool Calcium Up is evaluated for pool owners who need a straightforward way to raise calcium hardness. The bottom line: this dry granular \u003cstrong\u003ecalcium chloride\u003c\/strong\u003e formulation is for anyone balancing soft or RO-filled pools and spas who wants a fast, measurable increase in hardness without specialty equipment. It is most valuable where corrosion or etching of pool surfaces is a risk and when precise dosing guidance matters.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapidly increases hardness:\u003c\/strong\u003e The product uses calcium chloride to quickly raise total hardness so pools reach the recommended range for protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear dosing guidance:\u003c\/strong\u003e The label and included chart explain how much to add, with 8 ounces raising hardness about 10 ppm per 5,000 gallons, making calculations straightforward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile recommended ranges:\u003c\/strong\u003e The directions call out target ranges for vinyl, tile, aggregate, fiberglass and Marcite pools so users can match treatment to their surface type.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple application method:\u003c\/strong\u003e The granular product is dissolved in a plastic bucket then poured around the pool perimeter while circulating, which fits common maintenance routines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Domestic manufacture provides traceability for pool managers who prefer US-made chemicals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product is aimed at homeowners and hot tub owners who test calcium hardness regularly and need to correct low hardness that can cause corrosion or etching. It suits people who refill with RO or well water and want a cost-effective, concentrated calcium source that dissolves quickly and integrates with standard circulation systems.\u003c\/p\u003e\u003cp\u003eIt is not for users who cannot safely handle granular chemicals or who require pre-diluted liquid formulations. Also, those looking for a one-step, packaged dosing pod or a product with specialty packaging should consider alternatives, as some customers reported issues with bucket lids and spillage.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEffectively raises \u003cstrong\u003ecalcium hardness\u003c\/strong\u003e and dissolves quickly for rapid correction.\u003c\/li\u003e\n\u003cli\u003eClear dosing information (8 ounces = ~10 ppm per 5,000 gallons) makes calculations easy.\u003c\/li\u003e\n\u003cli\u003eWorks well as a cost-effective alternative to store-bought pool chemicals for large-volume treatments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003ePackaging lid quality has mixed reviews, and some customers experienced broken buckets or spillage during handling.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eDry granular calcium chloride\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e8 pounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDosage guidance\u003c\/td\u003e\n\u003ctd\u003e8 oz raises hardness 10 ppm per 5,000 gallons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended hardness\u003c\/td\u003e\n\u003ctd\u003eVinyl 200-300 ppm; Tile\/Aggregate 200-400 ppm; Fiberglass\/Marcite 250-400 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication method\u003c\/td\u003e\n\u003ctd\u003eDissolve in plastic bucket and pour around pool while circulating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum single addition\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\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Robelle 8-pound calcium hardness increaser is a practical, no-frills solution for owners who monitor and adjust total hardness to protect pool surfaces. It provides clear dosing, dissolves fast, and delivers reliable increases in \u003cstrong\u003ecalcium hardness\u003c\/strong\u003e, making it good value for large pools and RO refills; just handle the bucket and lid with care to avoid spillage.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow much will one container raise my pool?\u003c\/strong\u003e\u003cbr\u003eUse the chart: 8 oz raises hardness about 10 ppm per 5,000 gallons; scale dosing to your pool volume.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow should I add it to the pool?\u003c\/strong\u003e\u003cbr\u003eDissolve the granules in a plastic bucket of pool water (up to 2 lb per 5-gallon bucket) and slowly pour around the perimeter while the pump runs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it safe for all pool surfaces?\u003c\/strong\u003e\u003cbr\u003eYes when used to meet the recommended ranges for vinyl, tile, exposed aggregate, Marcite, fiberglass, and painted pools; test hardness first and follow label limits.\u003c\/p\u003e","brand":"Robelle","offers":[{"title":"Default Title","offer_id":48755613597915,"sku":"B0F7C4KZ7B","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71GJswOE_CL._AC_SL1500.jpg?v=1778790940","url":"https:\/\/gearmusthave.com\/products\/pool-calcium-hardness-increaser-robelle-8-lb-calcium-up","provider":"GearMustHave","version":"1.0","type":"link"}