{"product_id":"glb-calcium-hypochlorite-pool-shock-1-pound-packets-12-pack-73-formula-cyanuric-acid-free","title":"GLB Calcium Hypochlorite Pool Shock — 1-Pound Packets, 12-Pack, 73% Formula, Cyanuric-Acid-Free","description":"\u003cp\u003e\u003cstrong\u003eGLB SuperSonic Calcium Hypochlorite Pool Shock is a fast-acting, cyanuric-acid-free pool sanitizer and shock treatment sold in convenient 1-pound packets (12-pack) for routine clarifying, algae control, and oxidation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUse this 73% calcium hypochlorite formula to quickly raise available chlorine, clear cloudy water, and help control algae without adding stabilizer. The product dissolves cleanly on all typical pool surfaces, leaves no visible residue when used as directed, and is designed to avoid over-stabilizing the sanitizer level because it contains no cyanuric acid. Packaged as single-pound units, the 12-pack offers easy handling and measured dosing for residential pools.\u003c\/p\u003e\n\n\u003ch3\u003eHow much shock should I add to my pool and how often?\u003c\/h3\u003e\n\u003cp\u003eAdd 9 to 18 ounces of GLB SuperSonic per 10,000 gallons of water to provide approximately 5 to 10 ppm of available chlorine — the recommended range for routine shock treatments. Frequency depends on pool use, weather, and contamination: weekly shock for regular use, after heavy bather load, or following storms.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDosage: 9–18 oz per 10,000 gallons for 5–10 ppm available chlorine.\u003c\/li\u003e\n  \u003cli\u003eTypical schedule: weekly maintenance or as-needed after heavy use.\u003c\/li\u003e\n  \u003cli\u003eFor algae or severe contamination, follow graded treatments and retest chlorine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this product affect my pool’s stabilizer or leave residue?\u003c\/h3\u003e\n\u003cp\u003eGLB SuperSonic does not contain cyanuric acid (stabilizer), so it won’t raise CYA levels in your pool. When dissolved and applied according to instructions, it is formulated to leave no visible residue on standard pool finishes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo cyanuric acid — safe for pools where you want to control stabilizer levels.\u003c\/li\u003e\n  \u003cli\u003eLeaves no visible residue when dosed and mixed properly.\u003c\/li\u003e\n  \u003cli\u003eCompatible with common pool surfaces when used as directed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this shock fit into routine water chemistry maintenance?\u003c\/h3\u003e\n\u003cp\u003eUse SuperSonic as part of a maintenance routine that includes monitoring pH and alkalinity. For best results, keep pH between 7.2 and 7.6 and total alkalinity between 60 and 120 ppm to optimize sanitizer performance and swimmer comfort.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommended pH: 7.2–7.6 for effective chlorine action.\u003c\/li\u003e\n  \u003cli\u003eMaintain total alkalinity: 60–120 ppm to stabilize pH fluctuations.\u003c\/li\u003e\n  \u003cli\u003eTest water before and after shocking to confirm target chlorine and chemical balance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this product safe to use on all pool types and surfaces?\u003c\/h3\u003e\n\u003cp\u003eGLB’s calcium hypochlorite formula is intended for standard concrete, plaster, vinyl, and fiberglass pools when used as directed. Take precautions with calcium-sensitive equipment and avoid adding undissolved granules directly to the pool to prevent localized bleaching or deposits.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for concrete, plaster, vinyl, and fiberglass pools.\u003c\/li\u003e\n  \u003cli\u003eDissolve properly and distribute evenly to prevent localized effects.\u003c\/li\u003e\n  \u003cli\u003eMonitor calcium hardness if using shock frequently; consult product instructions for compatibility notes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: GLB SuperSonic 1-pound packets in a 12-pack are ideal for homeowners and pool service professionals seeking a reliable, high-strength shock that is easy to store and dose. It suits pools needing fast chlorine boosts without adding stabilizer, and it works well for regular maintenance, emergency clarifying treatments, and post-event sanitation.\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 GLB SuperSonic do I add per 10,000 gallons?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Add 9–18 ounces per 10,000 gallons to yield about 5–10 ppm available chlorine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this product contain cyanuric acid (stabilizer)?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, GLB SuperSonic is free of cyanuric acid and won’t increase CYA levels.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GLB","offers":[{"title":"Default Title","offer_id":56840843460948,"sku":"B09XJH6BSZ","price":136.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/glb-supersonic-front-packaging.jpg?v=1787073500","url":"https:\/\/gardenluxe.co.uk\/products\/glb-calcium-hypochlorite-pool-shock-1-pound-packets-12-pack-73-formula-cyanuric-acid-free","provider":"Gardenluxe Uk","version":"1.0","type":"link"}