{"product_id":"hth-pool-shock-ultra-calcium-hypochlorite-6-pack-6-x-1-lb-fast-dissolving-no-cya-blue-action-indicator","title":"HTH Pool Shock Ultra Calcium Hypochlorite 6-Pack (6 x 1 lb) — Fast-Dissolving, No CYA, Blue Action Indicator","description":"\u003cp\u003e\u003cstrong\u003eHTH 52040B Shock Ultra is a fast-dissolving, calcium hypochlorite pool shock sold in a 6-pack of 1 lb containers designed to rapidly raise free chlorine and restore clear water.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUse this Cal Hypo-based shock to quickly sanitize swimming pool water without adding cyanuric acid (CYA). The formula is created to tackle bacteria, algae, stains and cloudiness while being compatible with vinyl-lined pools and saltwater systems. A visible blue indicator shows the product in action, and routine use alongside testing helps maintain balanced water and improved filtration performance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this shock restore cloudy or green pool water?\u003c\/h3\u003e\n\n\u003cp\u003eThe concentrated calcium hypochlorite delivers a strong dose of free chlorine to oxidize contaminants and reduce organic load that causes cloudiness and algae. It works faster than routine sanitizers to bring chlorine to effective levels, helping filters and clarifiers perform better.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAdds free chlorine quickly to oxidize organics and algae.\u003c\/li\u003e\n  \u003cli\u003eBlue action indicator confirms dissolution and mixing.\u003c\/li\u003e\n  \u003cli\u003eNo CYA added, avoiding overstabilization that can trap chlorine.\u003c\/li\u003e\n  \u003cli\u003eOne-week weekly shock can solve most common pool clarity issues within 24 hours.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs HTH Shock Ultra safe for my pool type and equipment?\u003c\/h3\u003e\n\n\u003cp\u003eThis Cal Hypo shock is formulated to be compatible with most pool finishes and systems, including vinyl liners and saltwater pools. As with any oxidizer, follow label dosing, pre-dissolve or broadcast per instructions, and ensure proper calcium and pH balance to protect surfaces and equipment.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSuitable for vinyl-lined, plaster, and fiberglass pools.\u003c\/li\u003e\n  \u003cli\u003eSafe for saltwater systems when used per directions.\u003c\/li\u003e\n  \u003cli\u003eMonitor calcium hardness and pH to avoid scale or corrosion.\u003c\/li\u003e\n  \u003cli\u003eUse with regular testing (HTH 6-Way Test Strips recommended).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use this 6-pack most effectively and safely?\u003c\/h3\u003e\n\n\u003cp\u003eHandle one-pound containers individually to measure dose and avoid moisture exposure in storage. For shock treatments, apply to circulating water as directed—either pre-dissolved or broadcast according to your pool size—and retest chlorine and pH after treatment before swimming.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWear gloves and avoid inhalation when handling granules.\u003c\/li\u003e\n  \u003cli\u003eFollow label dosing for pool volume and condition.\u003c\/li\u003e\n  \u003cli\u003eAllow adequate circulation and wait for free chlorine to return to safe levels before swimming.\u003c\/li\u003e\n  \u003cli\u003eStore unopened packs in a cool, dry place away from other chemicals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat results should I expect and how often should I shock?\u003c\/h3\u003e\n\n\u003cp\u003eRegular weekly shocking helps prevent algae and maintains clarity; heavy contamination may need treatment more frequently. Many common pool problems clear within 24 hours when shocked properly, but consistent testing and maintenance keep results steady.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eWeekly use addresses about 90% of common pool issues.\u003c\/li\u003e\n  \u003cli\u003eExpect visible improvement in clarity within a day for typical issues.\u003c\/li\u003e\n  \u003cli\u003eUse test strips twice weekly to track free chlorine and pH.\u003c\/li\u003e\n  \u003cli\u003eIncrease frequency after heavy use, storms, or algae outbreaks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: HTH 52040B Shock Ultra is aimed at homeowners, pool service pros, and rental property managers who need a reliable, fast-acting calcium hypochlorite shock that doesn’t add stabilizer. It suits anyone maintaining vinyl-lined or saltwater pools who wants a visible action indicator, convenient one-pound dosing, and a multi-pack supply for routine shock treatments.\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: Can I use HTH Shock Ultra in a saltwater pool?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. HTH Shock Ultra is compatible with saltwater systems when used according to label instructions and balanced water chemistry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long after shocking is the pool safe to swim?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Wait until free chlorine returns to recommended swim levels—typically several hours; always test before swimming.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"HTH","offers":[{"title":"Default Title","offer_id":56838435733844,"sku":"B09R81TQBS","price":100.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/hth-shock-ultra-front-packaging.jpg?v=1787062655","url":"https:\/\/gardenluxe.co.uk\/products\/hth-pool-shock-ultra-calcium-hypochlorite-6-pack-6-x-1-lb-fast-dissolving-no-cya-blue-action-indicator","provider":"Gardenluxe Uk","version":"1.0","type":"link"}