--- product_id: 644856126 title: "HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (Pack of 6)" brand: "hth" price: "VT42987" currency: VUV in_stock: true reviews_count: 5 category: "Hth" url: https://www.desertcart.vu/products/644856126-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical store_origin: VU region: Vanuatu --- # Fast-acting chlorine boost Visible blue action indicator Cal Hypo formula, no CYA buildup HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (Pack of 6) **Brand:** hth **Price:** VT42987 **Availability:** ✅ In Stock ## Summary > 💦 Shock your pool into brilliance—because your summer deserves crystal clarity! ## Quick Answers - **What is this?** HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (Pack of 6) by hth - **How much does it cost?** VT42987 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/644856126-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical) ## Best For - hth enthusiasts ## Why This Product - Trusted hth brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Blue Action Assurance:** See the blue tint activate—proof your pool shock is working hard for crystal-clear water. - • **Sparkling Clarity, Fast:** Elevate your pool’s sparkle with rapid bacteria and algae elimination within 24 hours. - • **Cyanuric Acid Free Formula:** Avoid chlorine lock and overstabilization with a Cal Hypo formula that keeps your pool balanced. - • **Pro-Level Pool Maintenance:** Pair with HTH 6-Way Test Strips for precision water balance and solve 90% of pool issues weekly. - • **Universal Pool Compatibility:** Perfectly safe for vinyl-lined, saltwater, and all pool types—no compromises on care. ## Overview HTH 52040B Swimming Pool Care Shock Ultra is a powerful Cal Hypo based pool sanitizer that rapidly boosts chlorine levels without adding cyanuric acid, preventing chlorine lock. Its visible blue action indicator confirms effectiveness, while its formula prevents bacteria, algae, stains, and scale buildup. Compatible with all pool types including vinyl and saltwater, it works best when combined with HTH 6-Way Test Strips for optimal water balance and clarity. ## Description HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) Review: This is our first year having a pool. After trying several different shocks we settled on HTH Ultra Pool Shock.The product dissolves quickly and doesn’t leave behind any residue or cloudy water like some cheaper shock treatments I’ve tried in the past. Within a few hours of application, the water looks noticeably clearer, and it does a great job of eliminating that faint “chlorine smell” and any algae or bacteria growth. I also appreciate that the dosing instructions are straightforward, so there’s no guessing game when treating different pool sizes. One packet is usually enough to restore balance after a heavy swim day, rainstorm, or when the water just starts to look a little dull. It gives me peace of mind knowing that my family is swimming in clean, well-sanitized water. Overall, HTH Ultra Pool Shock is reliable, effective, and worth the price for the results you get. If you want a hassle-free way to maintain crystal-clear water, I highly recommend it. Review: Excellent for my salt water pool ## Features - BENEFIT: Use this all-in-one powerhouse pool shock to increase chlorine levels, prevent bacteria, algae, stain, and scale, reduce skin and eye irritation, improve filtration, and soften your swimming pool water quickly and easily - VISIBLY BRILLIANT SPARKLE: This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock - VISIBLE BLUE ACTION: This built-in feature lets you know the product is working - COMPATIBLE WITH ALL SWIMMING POOLS: This product is great for all pool types including vinyl-lined pools and saltwater systems - YOU'RE ALL CLEAR WITH HTH: For best results, use with HTH 6-Way Test Strips to test and balance your swimming pool water twice weekly; Use weekly to solve 90% of pool problems within 24 hours and restore crystal clarity ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09R81TQBS | | Brand Name | HTH | | Customer Reviews | 4.7 4.7 out of 5 stars (534) | | Included Components | HTH 52040 Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (Pack of 6) | | Item Form | Granular | | Item Type Name | Swimming Pool Chemical Prevents Bacteria, Algae, Stain & Scale, Cal Hypo Formula | | Item Weight | 6.3 Pounds | | Manufacturer | Innovative Water Care | | Product Benefits | Kills Bacteria | | UPC | 073187520401 | | Unit Count | 6 Count | ## Product Details - **Brand:** HTH - **Item form:** Granular - **Item weight:** 2.86 kg - **Product benefits:** Kills Bacteria - **UPC:** 073187520401 ## Images ![HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (Pack of 6) - Image 1](https://m.media-amazon.com/images/I/81aKILdYRbL.jpg) ## Questions & Answers **Q: Can this replace weekly chlorine?** A: This is a sanitizer that is used as weekly shock or your regular sanitizer maintenance. The amount you use for weekly shock and the amount for maintenance is different based upon the pool water volume. Ideally, this is used for Shock but we can help with regular maintenance dose if you choose to not use a tablet in your skimmer. Please consider calling our Consumer Engagement Team for more precise recommendations and dosing details. We're available M-F, 9 AM - 7 PM at 866-484-7665. **Q: What is the percentage of available chlorine?** A: This product has 56.44% available chlorine. **Q: How long do you have to wait after adding shock before you can swim?** A: The general rule is to wait at least an hour per pound of granular product, to allow it to dissolve and dilute properly. Before you enter the pool, make sure to test and that the chlorine level is between 1-4 ppm (and NOT ABOVE 5 ppm) for the safest swimming. **Q: 1 bag treats how many gallons water** A: We are the manufacturer of HTH® Pool Care Shock Ultra and one of our 1 lb. bags treats 13,500 gallons of swimming pool water. If you have any more questions just give us a call at 866-484-7665. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by T***I on 17 September 2025* This is our first year having a pool. After trying several different shocks we settled on HTH Ultra Pool Shock.The product dissolves quickly and doesn’t leave behind any residue or cloudy water like some cheaper shock treatments I’ve tried in the past. Within a few hours of application, the water looks noticeably clearer, and it does a great job of eliminating that faint “chlorine smell” and any algae or bacteria growth. I also appreciate that the dosing instructions are straightforward, so there’s no guessing game when treating different pool sizes. One packet is usually enough to restore balance after a heavy swim day, rainstorm, or when the water just starts to look a little dull. It gives me peace of mind knowing that my family is swimming in clean, well-sanitized water. Overall, HTH Ultra Pool Shock is reliable, effective, and worth the price for the results you get. If you want a hassle-free way to maintain crystal-clear water, I highly recommend it. ### ⭐⭐⭐⭐⭐ Review *by K***N on 11 April 2026* Excellent for my salt water pool ### ⭐⭐⭐⭐⭐ Review *by J***V on 31 October 2025* Works well, in algae control, ease of use, and different ways you can apply it, just read and follow instructions. ## Frequently Bought Together - HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) - HTH 67067 Swimming Pool Care Clarifier Advanced - Crystal Clear Water in 24 Hours - HTH 52038 Swimming Pool Care Green to Blue, Advanced Shock System, 2-Step Swimming Pool Care Solution, 1 Kit --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/644856126-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical](https://www.desertcart.vu/products/644856126-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-08*