{"product_id":"southern-leisure-hardness-plus-calcium-increaser-1-lb","title":"Southern Leisure Hardness+ Calcium Hardness Increaser – 1 lb.","description":"\u003ch2\u003eRaise Low Calcium Hardness and Help Protect Your Spa\u003c\/h2\u003e\n\u003cp\u003eSouthern Leisure Hardness+ is a professional-grade calcium hardness increaser formulated to raise low calcium levels in hot tubs and swim spas. The fast-dissolving calcium chloride granules help correct soft, aggressive water and support properly balanced spa water.\u003c\/p\u003e\n\u003cp\u003eCalcium hardness is an important part of water balance alongside total alkalinity and pH. Water with insufficient calcium may contribute to corrosion and premature wear of heaters, pump components, metal fittings, and other spa equipment. Excessively hard water can promote scale, cloudy water, and mineral deposits.\u003c\/p\u003e\n\u003cp\u003eFor most portable spas, maintain calcium hardness within the spa manufacturer’s recommended range. FROG @ease specifies a total-hardness range of 150–250 ppm. Southern Leisure generally recommends targeting approximately 175–225 ppm within that range unless the spa manufacturer provides different instructions.\u003c\/p\u003e\n\u003ch3\u003e🔹 Key Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRaises low calcium hardness in spa water\u003c\/li\u003e\n\u003cli\u003eHelps correct soft, aggressive water conditions\u003c\/li\u003e\n\u003cli\u003eSupports protection of heaters, pumps, plumbing, and metal components\u003c\/li\u003e\n\u003cli\u003eHelps reduce the risk of corrosion and premature equipment wear\u003c\/li\u003e\n\u003cli\u003eSupports stable, properly balanced water chemistry\u003c\/li\u003e\n\u003cli\u003eFast-dissolving granular calcium chloride formula\u003c\/li\u003e\n\u003cli\u003eEasy to measure for spas of different capacities\u003c\/li\u003e\n\u003cli\u003eCompatible with chlorine and bromine water-care programs\u003c\/li\u003e\n\u003cli\u003eCompatible with FROG @ease when the water is balanced to the system’s requirements\u003c\/li\u003e\n\u003cli\u003eSuitable for acrylic portable hot tubs and swim spas\u003c\/li\u003e\n\u003cli\u003eIdeal for balancing fresh water after a drain and refill\u003c\/li\u003e\n\u003cli\u003eConcentrated one-pound container provides multiple spa treatments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e📋 How to Use\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDetermine the spa’s actual water capacity.\u003c\/li\u003e\n\u003cli\u003eTest the water before adding Hardness+.\u003c\/li\u003e\n\u003cli\u003eAdjust total alkalinity and pH before completing the calcium-hardness adjustment.\u003c\/li\u003e\n\u003cli\u003eDetermine the difference between the current hardness reading and the desired level.\u003c\/li\u003e\n\u003cli\u003eMeasure approximately ¾ ounce per 500 gallons for each 10 ppm increase required.\u003c\/li\u003e\n\u003cli\u003eFill a clean plastic bucket with spa water.\u003c\/li\u003e\n\u003cli\u003eSlowly add the measured Hardness+ to the water. Always add the chemical to water—never pour water into concentrated chemical.\u003c\/li\u003e\n\u003cli\u003eStir carefully until the granules are dissolved. Calcium chloride generates heat while dissolving.\u003c\/li\u003e\n\u003cli\u003eWith the circulation system operating and the spa unoccupied, slowly distribute the solution around the perimeter of the spa.\u003c\/li\u003e\n\u003cli\u003eLeave the cover open and allow the water to circulate thoroughly.\u003c\/li\u003e\n\u003cli\u003eWait for the period specified on the product label before retesting.\u003c\/li\u003e\n\u003cli\u003eRepeat with another measured dose if additional adjustment is required.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpa Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eApproximate Amount for a 10 ppm Increase\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300 gallons\u003c\/td\u003e\n\u003ctd\u003e0.45 ounce\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e400 gallons\u003c\/td\u003e\n\u003ctd\u003e0.60 ounce\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500 gallons\u003c\/td\u003e\n\u003ctd\u003e0.75 ounce\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1,000 gallons\u003c\/td\u003e\n\u003ctd\u003e1.50 ounces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e A 400-gallon spa that needs a 50 ppm increase requires approximately 3 ounces of Hardness+. Divide larger corrections into smaller additions and retest between doses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The dosage chart is calculated from the product’s stated ¾-ounce-per-500-gallon dosage. Always follow the current directions and precautions printed on the container.\u003c\/p\u003e\n\u003ch3\u003e💬 Southern Leisure Says\u003c\/h3\u003e\n\u003cp\u003eWater can look perfectly clear while still having insufficient calcium hardness. Because damage from aggressive water may develop inside the heater, pumps, fittings, and plumbing, a visual inspection alone cannot confirm that the water is properly balanced.\u003c\/p\u003e\n\u003cp\u003eTest hardness every time the spa is drained and refilled—especially when the home has naturally soft water or a water-softening system. Correcting a low reading at startup is much easier than dealing with corrosion or premature component wear later.\u003c\/p\u003e\n\u003ch3\u003e🧼 Care \u0026amp; Maintenance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTest hardness whenever the spa is filled or topped off substantially.\u003c\/li\u003e\n\u003cli\u003eRetest periodically because source water and evaporation can affect mineral concentration.\u003c\/li\u003e\n\u003cli\u003eKeep the container tightly closed when not in use.\u003c\/li\u003e\n\u003cli\u003eStore in a cool, dry, well-ventilated location.\u003c\/li\u003e\n\u003cli\u003eProtect the product from moisture and humidity.\u003c\/li\u003e\n\u003cli\u003eUse only a clean, dry measuring scoop.\u003c\/li\u003e\n\u003cli\u003eDo not return unused product to the container.\u003c\/li\u003e\n\u003cli\u003eDo not mix Hardness+ with another chemical in the same bucket or measuring container.\u003c\/li\u003e\n\u003cli\u003eAlways add the product to water—not water to the concentrated product.\u003c\/li\u003e\n\u003cli\u003eBe aware that calcium chloride releases heat as it dissolves.\u003c\/li\u003e\n\u003cli\u003eAvoid contact with the eyes and skin.\u003c\/li\u003e\n\u003cli\u003eKeep out of reach of children and pets.\u003c\/li\u003e\n\u003cli\u003eFollow all handling, first-aid, and safety instructions printed on the container.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e📌 Product Quick Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Southern Leisure Hardness+\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary purpose:\u003c\/strong\u003e Raises calcium hardness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormula:\u003c\/strong\u003e Granular calcium chloride\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive ingredient:\u003c\/strong\u003e Calcium chloride, 100%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet weight:\u003c\/strong\u003e 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDosage:\u003c\/strong\u003e Approximately ¾ ounce per 500 gallons raises calcium hardness approximately 10 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommon spa range:\u003c\/strong\u003e 150–250 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSouthern Leisure preferred target:\u003c\/strong\u003e Approximately 175–225 ppm unless otherwise specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible sanitizers:\u003c\/strong\u003e Chlorine, bromine, and FROG @ease programs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 37001-SL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e⚙️ Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSouthern Leisure Spas \u0026amp; Wellness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHardness+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e37001-SL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpa calcium hardness increaser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFormula\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFast-dissolving granules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActive Ingredient\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCalcium chloride, 100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNet Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 lb. \/ 16 oz. \/ approximately 454 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLabeled Dosage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately ¾ oz. per 500 gallons for a 10 ppm increase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommon Hardness Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150–250 ppm or the spa manufacturer’s specified range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSouthern Leisure Target\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 175–225 ppm unless otherwise specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Sanitizers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eChlorine, bromine, and FROG @ease\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Spas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePortable acrylic hot tubs and swim spas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAs needed following a low hardness test result\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePre-dissolve in spa water and add with circulation operating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e❓ Frequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat does Southern Leisure Hardness+ do?\u003c\/h4\u003e\n\u003cp\u003eIt adds calcium chloride to spa water, raising the calcium-hardness level when testing shows that the water is too soft.\u003c\/p\u003e\n\u003ch4\u003eWhat should calcium hardness be in a hot tub?\u003c\/h4\u003e\n\u003cp\u003eA commonly recommended range for portable hot tubs is 150–250 ppm. FROG @ease also specifies a total-hardness range of 150–250 ppm. Southern Leisure generally targets approximately 175–225 ppm unless the spa manufacturer specifies otherwise.\u003c\/p\u003e\n\u003ch4\u003eHow much Hardness+ should I add?\u003c\/h4\u003e\n\u003cp\u003eApproximately ¾ ounce per 500 gallons raises calcium hardness about 10 ppm. Adjust the dosage for the spa’s actual capacity and the number of ppm it needs to increase.\u003c\/p\u003e\n\u003ch4\u003eCan I add Hardness+ directly to the spa?\u003c\/h4\u003e\n\u003cp\u003ePre-dissolving the measured product in a clean plastic bucket of spa water promotes even distribution. Always add the product slowly to water, never water to concentrated calcium chloride, because the dissolving process generates heat.\u003c\/p\u003e\n\u003ch4\u003eHow soon should I retest the water?\u003c\/h4\u003e\n\u003cp\u003eAllow the product to dissolve and circulate completely, then follow the waiting period printed on the container before retesting. Avoid adding multiple large doses without testing between adjustments.\u003c\/p\u003e\n\u003ch4\u003eCan I use Hardness+ with FROG @ease?\u003c\/h4\u003e\n\u003cp\u003eYes. FROG @ease requires properly balanced water and specifies total hardness between 150 and 250 ppm. Use FROG @ease Test Strips or an appropriate water test to verify the level before adding Hardness+.\u003c\/p\u003e\n\u003ch4\u003eCan I use it with chlorine or bromine?\u003c\/h4\u003e\n\u003cp\u003eYes. Hardness+ is a water-balancing product and is compatible with properly maintained chlorine and bromine sanitation programs.\u003c\/p\u003e\n\u003ch4\u003eShould I add Hardness+ after every refill?\u003c\/h4\u003e\n\u003cp\u003eOnly when testing shows that the hardness is below the desired range. Some source water already contains sufficient or excessive calcium and does not need an increaser.\u003c\/p\u003e\n\u003ch4\u003eWhat happens if calcium hardness is too low?\u003c\/h4\u003e\n\u003cp\u003eWater with insufficient hardness may become aggressive and contribute to corrosion, pitting, and premature wear of heaters, pump components, fittings, and other spa equipment.\u003c\/p\u003e\n\u003ch4\u003eWhat happens if calcium hardness is too high?\u003c\/h4\u003e\n\u003cp\u003eExcessively hard water can contribute to scale, cloudy water, rough deposits, white flakes, and buildup on heaters, jets, plumbing, and spa surfaces.\u003c\/p\u003e\n\u003ch4\u003eCan Hardness+ lower a high hardness reading?\u003c\/h4\u003e\n\u003cp\u003eNo. Hardness+ only raises calcium hardness. Lowering an excessive level usually requires partially draining the spa and replacing some water with lower-hardness source water.\u003c\/p\u003e\n\u003ch4\u003eAre calcium hardness and total hardness the same?\u003c\/h4\u003e\n\u003cp\u003eNot exactly. Calcium hardness measures dissolved calcium, while total hardness includes calcium and magnesium. Many spa test strips report total hardness, so follow the test-product scale and the spa or sanitizer manufacturer’s instructions.\u003c\/p\u003e\n\u003ch4\u003eCan I fill the spa through a household water softener?\u003c\/h4\u003e\n\u003cp\u003eFully softened water frequently has insufficient calcium hardness. If softened water must be used, test it carefully and add Hardness+ as required. When possible, consult Southern Leisure about the best filling method for your source water and spa model.\u003c\/p\u003e\n\u003ch3\u003e🛡️ Why Buy From Southern Leisure?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSouthern Leisure private-label water-care product\u003c\/li\u003e\n\u003cli\u003eTrusted by spa owners since 2013\u003c\/li\u003e\n\u003cli\u003ePersonally recommended by our experienced service team\u003c\/li\u003e\n\u003cli\u003ePractical water-balancing guidance before and after purchase\u003c\/li\u003e\n\u003cli\u003eHelp calculating the proper dosage for your spa\u003c\/li\u003e\n\u003cli\u003eCompatible-product recommendations for complete water care\u003c\/li\u003e\n\u003cli\u003eCarefully packaged for dependable delivery\u003c\/li\u003e\n\u003cli\u003eLocal pickup available for Dallas–Fort Worth customers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e📦 Shipping \u0026amp; Pickup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShipping available throughout the continental United States\u003c\/li\u003e\n\u003cli\u003eLocal pickup available at Southern Leisure Spas \u0026amp; Wellness\u003c\/li\u003e\n\u003cli\u003eMost in-stock orders ship within one to two business days\u003c\/li\u003e\n\u003cli\u003eAvailable shipping methods and charges are displayed at checkout\u003c\/li\u003e\n\u003cli\u003eChemical products may be subject to carrier and destination restrictions\u003c\/li\u003e\n\u003cli\u003eThis product cannot be shipped to Alaska, Hawaii, Canada, or international destinations\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Southern Leisure Spas \u0026 Wellness","offers":[{"title":"Default Title","offer_id":47270656770217,"sku":"37001-SL","price":7.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/9939\/6265\/files\/southern-leisure-hardness-calcium-hardness-increaser-1-lb-2565188.png?v=1785846906","url":"https:\/\/shop.southernleisurespas.com\/products\/southern-leisure-hardness-plus-calcium-increaser-1-lb","provider":"Southern Leisure Spas \u0026 Wellness","version":"1.0","type":"link"}