--- product_id: 451659197 title: "HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)" brand: "hth" price: "$145.20" currency: USD in_stock: true reviews_count: 9 category: "Hth" url: https://www.desertcart.us/products/451659197-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical store_origin: US region: United States of America --- # Fast-dissolving formula Visible blue action indicator Cal Hypo formula, no cyanuric acid HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) **Brand:** hth **Price:** $145.20 **Availability:** ✅ In Stock ## Summary > 💧 Shock your pool into brilliance with HTH Ultra – clarity you can see and trust! ## Quick Answers - **What is this?** HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) by hth - **How much does it cost?** $145.20 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/451659197-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 - • **Gentle Yet Powerful:** Reduces skin and eye irritation while improving filtration and softening water. - • **Trusted & Top-Ranked:** #1 in Swimming Pool Chlorine with 4.8-star rating from over 1,200 pool pros and enthusiasts. - • **Blue Action Assurance:** Unique visible blue color confirms active sanitization, so you know it’s working. - • **Crystal Clear Confidence:** Eliminates bacteria, algae, stains & scale within 24 hours for sparkling pool water. - • **No More Chlorine Guesswork:** Straightforward dosing tailored for all pool sizes and types, including saltwater & vinyl-lined pools. ## Overview HTH 52040B Swimming Pool Care Shock Ultra is a fast-acting, Cal Hypo-based granular pool shock that sanitizes without adding cyanuric acid, preventing chlorine lock. Designed for all pool types, it visibly signals its action with a blue tint, kills bacteria and algae, reduces irritation, and restores crystal-clear water within 24 hours. Trusted by thousands, it’s the go-to solution for hassle-free, professional-grade pool care. ## Description HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) Review: The only kind we purchase! - 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: Shocked - Works well. ## 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 | | Best Sellers Rank | #20 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Swimming Pool Chlorine | | Brand | HTH | | Brand Name | HTH | | Customer Reviews | 4.8 out of 5 stars 1,205 Reviews | | 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, Cal Hypo Formula, 1lb (6 Pack) | | Item Weight | 6.3 Pounds | | Manufacturer | Innovative Water Care | | Manufacturer Part Number | 52040B | | Manufacturer Warranty Description | Warranty | | Model Number | 52040B | | Number of Items | 1 | | Number of Packs | 6 | | Product Benefits | Kills Bacteria | | UPC | 073187520401 | | Unit Count | 6.0 Count | ## Product Details - **Brand:** HTH - **Item Weight:** 6.3 Pounds - **Item Form:** Granular - **Product Benefits:** Kills Bacteria - **UPC:** 073187520401 ## Images ![HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) - Image 1](https://m.media-amazon.com/images/I/81aKILdYRbL.jpg) ## Available Options This product comes in different **Size, Style** options. ## 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* 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. ### ⭐⭐⭐⭐⭐ Shocked *by M***K on May 24, 2026* Works well. ### ⭐⭐⭐⭐⭐ My go to. Great product *by K***N on April 11, 2026* Excellent for my salt water pool ## 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/451659197-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical](https://www.desertcart.us/products/451659197-hth-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-13*