--- product_id: 724940680 title: "52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6)" brand: "hth" price: "$292.66" currency: USD in_stock: true reviews_count: 5 category: "Hth" url: https://www.desertcart.us/products/724940680-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-calhipo store_origin: US region: United States of America --- # Fast-acting chlorine boost Visible blue action indicator Cal-Hypo formula, no chlorine lock 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6) **Brand:** hth **Price:** $292.66 **Availability:** ✅ In Stock ## Summary > 💦 Shock Your Pool to Perfection—See the Blue, Feel the Clean! ## Quick Answers - **What is this?** 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6) by hth - **How much does it cost?** $292.66 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/724940680-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-calhipo) ## 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 - • **Visible Blue Action:** Instantly know the shock is working with a unique blue indicator—no guesswork needed. - • **Safe for All Pool Types:** Perfectly compatible with vinyl-lined and saltwater pools, ensuring universal pool care. - • **Powerful All-in-One Shock:** Elevate pool hygiene by eliminating bacteria, algae, and grime with a single treatment. - • **Reduces Skin & Eye Irritation:** Gentle on swimmers while tough on contaminants, making every swim comfortable. - • **Crystal Clear Water in 24 Hours:** Experience visibly brilliant, softened water that invites you to dive in. ## Overview HTH 52040B Swimming Pool Care Shock Ultra is a 1 lb cal-hypo based chlorine shock designed to rapidly disinfect and clarify all types of swimming pools. Its unique visible blue action confirms effectiveness while preventing chlorine lock by excluding cyanuric acid. Safe for vinyl and saltwater pools, it reduces skin and eye irritation and restores crystal-clear water within 24 hours of weekly use. ## Description Product Description HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6) Directions Apply directly to the pool or through the skimmer as directed Review: The only kind we purchase! Review: My go to. Great product ## Features - BENEFITS: Increase chlorine levels and prevent bacteria, algae, dirt and dandruff, reduce skin and eye irritation, improve filtration and soften swimming pool water quickly and easily - VISIBLE BRIGHT SHINE: This calhypo-based formula disinfects without the added of cyanuric acid (CYA) to prevent excessive stabilization and chlorine lock - VISIBLE BLUE ACTION: This built-in feature allows you to know that the product is working - FITS ALL SWIMMING POOLS: This product is perfect for all types of pools, including vinyl lined pools and saltwater systems - CLEAR EVERYTHING WITH HTH: For best results, test your swimming pool water twice a week with the HTH 6-way test strip. Solve pool problems and restore crystal clarity within 24 hours after weekly use ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09R81TQBS | | Amazon Bestseller | #571,303 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #18 in Swimming Pool Chlorine | | Brand | HTH | | Brand Name | HTH | | Customer Reviews | 4.7 out of 5 stars 534 Your Review | | Included Components | HTH 52040B Swimming Pool Care Shock Ultra | | Item Form | Granular | | Item Type Name | HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6) | | Item Weight | 6.3 Pounds | | Manufacturer | Innovative Water Care | | Number of Items | 1 | | Product Benefits | Kills Bacteria | | UPC | 073187520401 | | Unit Count | 6.0 Count | ## Product Details - **Brand:** HTH - **Item Weight:** 2.86 kg - **Item Form:** Granular - **Product Benefits:** Kills Bacteria - **UPC:** 073187520401 ## Images ![52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (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 ### ⭐⭐⭐⭐⭐ The only kind we purchase! *by T***I on September 17, 2025* ### ⭐⭐⭐⭐⭐ My go to. Great product *by K***N on April 11, 2026* ### ⭐⭐⭐⭐⭐ Works well! *by J***V on October 31, 2025* ## 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.us/products/724940680-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-calhipo](https://www.desertcart.us/products/724940680-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-calhipo) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-14*