{"title":"Calcium Hardness Adjusters for Pool \u0026 Spa","description":"\u003cp\u003eMaintain proper \u003cstrong\u003ecalcium hardness levels\u003c\/strong\u003e in your pool or spa with specialized \u003cstrong\u003ecalcium increasers\u003c\/strong\u003e. Low hardness can lead to corrosive water that damages surfaces, heaters, and plumbing—especially in plaster or concrete pools. Using a \u003cstrong\u003ecalcium hardness adjuster\u003c\/strong\u003e ensures your water has enough dissolved calcium to protect your system and maintain a comfortable swimming experience.\u003c\/p\u003e","products":[{"product_id":"natural-chemistry-calcium-increaser-1-83-lb-bottle-14205ncm","title":"Natural Chemistry Calcium Increaser, 1.83 lb Bottle | 14205NCM","description":"\u003cp\u003eNatural Chemistry Spa Calcium Hardness Increaser - 1.83 lb Bottle\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNatural Chemistry’s Spa Calcium Increaser is used to raise calcium hardness in spa water. Calcium hardness in spa water should be maintained between 150-250 ppm. Low calcium hardness levels could cause the spa water to be corrosive which may result in damage to the spa surface or equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned to raise calcium hardness of spa water\u003c\/p\u003e\n\u003cp\u003ePrevents corrosion damage and bather irritation caused by low calcium hardness levels\u003c\/p\u003e\n\u003ch3\u003eFeatures and Benefits:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRaises calcium hardness in spa and hot tub water\u003c\/li\u003e\n\u003cli\u003eReduces cloudy water caused by low calcium levels\u003c\/li\u003e\n\u003cli\u003eLow calcium hardness levels could cause the water to become corrosive, which may result in damage to the spa surface or equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv data-id=\"e5c641b7-2fe4-4746-8d72-d3d698144c94\" class=\"bc-text-wrapper component-wrapper bc-center media-7d3ee0ac\"\u003e\n\u003cdiv class=\"component-inner vertical-top media-6c448b3e\"\u003e\n\u003cdiv class=\"bc-text bc-component\"\u003e\n\u003cdiv class=\"bc-text-content\" data-id=\"37316073-81c2-4a98-9bb1-2bc7105571e8\"\u003e\n\u003cdiv class=\"bc-rich-text public-DraftEditor-content\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eINSTRUCTIONS\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-id=\"7fab4380-677e-4808-9f18-6e7cb801d1d0\" class=\"bc-text-wrapper component-wrapper bc-center\"\u003e\n\u003cdiv class=\"component-inner vertical-top media-27a9d1e7\"\u003e\n\u003cdiv class=\"bc-text bc-component\"\u003e\n\u003cdiv class=\"bc-text-content\" data-id=\"43baed43-a801-4fce-816e-f96f16085e68\"\u003e\n\u003cdiv class=\"bc-rich-text public-DraftEditor-content\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eDirections for use:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eRead the entire label before using.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eTest spa water for calcium hardness level\u003c\/li\u003e\n\u003cli\u003eCompare test results to chart below to determine appropriate amount of product necessary to make adjustment.\u003c\/li\u003e\n\u003cli\u003eWith spa circulating pump on high speed, add required amount directly into spa water. Continue circulating water a minimum 20 minutes. Do not pre-dissolve this treatment as heat is generated when it contacts water.\u003c\/li\u003e\n\u003cli\u003eRetest and adjust if necessary.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-id=\"5f313a85-4b07-43f5-bfb3-46bff1c78f10\" data-name=\"Chart\" class=\"bc-container-wrapper component-wrapper bc-center\"\u003e\n\u003cdiv class=\"component-inner vertical-top media-6c448b3e\"\u003e\n\u003cdiv data-id=\"807100c8-0d81-4f18-bcab-408f78485cdd\" data-name=\"100\" class=\"bc-container-wrapper component-wrapper bc-left media-fad763bf\"\u003e\n\u003cdiv class=\"component-inner vertical-top media-6c448b3e\"\u003e\n\u003cdiv data-id=\"17cd246e-4651-4582-80ad-d4c2f9c8c593\" class=\"bc-text-wrapper component-wrapper bc-center\"\u003e\n\u003cdiv class=\"component-inner vertical-top media-2d30a33a\"\u003e\n\u003cdiv class=\"bc-text bc-component\"\u003e\n\u003cdiv class=\"bc-text-content\" data-id=\"405a9e45-81fa-4ccd-8e2d-595e65f84fd2\"\u003e\n\u003cdiv class=\"bc-rich-text public-DraftEditor-content\"\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/14205NCM-Dosage.jpg?v=1748456586\" alt=\"dosage chart showing spa volume in gallons on vertical axis and calcium increaser amounts in dry ounces at different ppm levels from 20 to 100 ppm on horizontal axis\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Natural Chemistry","offers":[{"title":"Default Title","offer_id":51589342986515,"sku":"14205NCM","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/NCH14205NCM_0_123ec6bb-2582-4cfc-9665-731eced9ad49.jpg?v=1748456909"},{"product_id":"glb-calcium-hardness-up-15-lb-bag-71251a","title":"GLB Calcium Hardness Up, 15 lb Bag | 71251A","description":"\u003cp\u003eUse calcium hardness up to increase water hardness levels, help prevent equipment and surface corrosion as well as minimize foaming.\u003c\/p\u003e\u003ch3\u003eFeatures and Benefits:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCalcium hardness levels should be maintained at 150-250 ppm\u003c\/li\u003e\n\u003cli\u003eOne pound increases calcium hardness 10 ppm in 10,000 gallons of water\u003c\/li\u003e\n\u003cli\u003eCompatible with chlorine, bromine, mineral purification systems, salt water chlorine and ozone sanitizing systems\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GLB","offers":[{"title":"Default Title","offer_id":51774169055507,"sku":"71251A","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/LZA71251A_0.png?v=1748382859"},{"product_id":"pool-breeze-calcium-hardness-increaser-8-lb-bag-88674","title":"Pool Breeze Calcium Hardness Increaser 8 lb Bag | 88674","description":"\u003cp\u003e\u003cspan\u003eCalcium Hardness Increaser is used to raise the \u003cstrong\u003ecalcium hardness\u003c\/strong\u003e of swimming pool water. Low calcium hardness may cause the pool water to be corrosive, resulting in corrosion of pool surfaces and equipment. Plaster finished pools may be etched or stained if the calcium hardness of the pool water is not properly adjusted. The calcium hardness of chlorinated pool water should be maintained in the \u003cstrong\u003erange of 200-500 ppm with a maximum of 1,000 ppm\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNot sure about the level of your calcium hardness?  We recommend checking out our \u003ca title=\"Shop Test Strips at Poolaroo\" href=\"https:\/\/poolaroo.com\/collections\/test-strips\"\u003e\u003cspan style=\"color: rgb(0, 170, 255);\"\u003e\u003cstrong\u003eTest Strips to find a multi-test strip\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e that includes hardness.\u003c\/span\u003e\u003c\/p\u003e","brand":"Pool Breeze","offers":[{"title":"Default Title","offer_id":52571717402899,"sku":"88674","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/Product-Pool-Breeze-Bags-Calcium-Hardness-Increaser-Front_2x-768x1010.jpg?v=1761851082"}],"url":"https:\/\/poolaroo.com\/collections\/calcium-hardness-adjusters-for-pool-spa.oembed","provider":"Poolaroo","version":"1.0","type":"link"}