{"product_id":"coral-seas-yellow-out-pool-shock-4-lb-algae-control-quick-chlorine-boost","title":"Coral Seas Yellow Out Pool Shock – 4 lb Algae Control \u0026 Quick Chlorine Boost","description":"\u003cp\u003eMeet Coral Seas Yellow Out, a 4 lb pool shock-enhancing treatment designed to energize your water care routine. The formula targets algae across multiple strains—green, brown, pink, and mustard—and you might notice clearer water and reduced tint within 24 hours when used as part of a consistent maintenance plan. The product is formulated to be gentle on surfaces yet tough on unwanted algae, with dissolving action that happens quickly and requires no brushing. After you add Yellow Out, a follow-up oxidizer is needed to activate its power; you can choose from chlorine, chlorine-based bleach, or a non-chlorine shock depending on your pool’s balance and your personal preferences. The blend is safe to use on plaster, fiberglass, vinyl, and with salt generator systems, giving you flexibility whether you’re keeping a classic pool or a modern saltwater setup. For best results, maintain your usual sanitizer levels and test the water regularly to fine-tune dosage as needed.\u003c\/p\u003e\n\u003ch2\u003eKey benefits\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMulti-purpose support for chlorine, hardness, and pH to help balanced water and inviting clarity.\u003c\/li\u003e\n  \u003cli\u003eHigh-potency pool shock designed for effective algae control with minimal effort.\u003c\/li\u003e\n  \u003cli\u003eInstant dissolution, no brushing required, so you can apply and move on.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eUsage and dosing\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e2 lb per 15,000 gallons as a general guide for mid-size pools.\u003c\/li\u003e\n  \u003cli\u003eNever premix Yellow Out with chlorine or other chemicals; add directly to pool water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to activate\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eAfter adding Yellow Out, wait about 5 minutes, then add your preferred oxidizer (chlorine, bleach, or non-chlorine shock) to activate the treatment.\u003c\/li\u003e\n  \u003cli\u003eFor best results, apply at night and allow 8–10 hours before swimming.\u003c\/li\u003e\n  \u003cli\u003eTest your water before use and adjust according to pool chemistry and local guidelines.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003ePool compatibility and safety\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSafe for plaster, fiberglass, vinyl pools, and compatible with salt generators.\u003c\/li\u003e\n  \u003cli\u003eDesigned to support ongoing pool balancing as part of routine maintenance.\u003c\/li\u003e\n\u003c\/ul\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: What is Yellow Out and how does it work?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yellow Out targets algae by delivering oxidizing power once activated with chlorine, bleach, or non-chlorine shock.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How much Yellow Out should I use for my pool?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A 2 lb bag treats about 15,000 gallons; add to water, wait 5 minutes, then add your preferred oxidizer.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Coral Seas","offers":[{"title":"Default Title","offer_id":45768063189178,"sku":"B002WKF9SO","price":88.56,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/3536\/8890\/files\/coral-seas-yellow-out-bottle-pour_fd96f584-9c06-4aec-90bc-0ab5784aa2e4.jpg?v=1775810884","url":"https:\/\/gardencanada.ca\/products\/coral-seas-yellow-out-pool-shock-4-lb-algae-control-quick-chlorine-boost","provider":"Garden Canada","version":"1.0","type":"link"}