--- product_id: 712880616 title: "Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack" brand: "rx clear" price: "€ 76.14" currency: EUR in_stock: true category: "Rx Clear" url: https://www.desertcart.be/products/712880616-rx-clear-mega-shock-73-calcium-hypochlorite-kills-algae-in store_origin: BE region: Belgium --- # Nighttime application - Maximize shock power 73% Calcium Hypochlorite - Ultra-strong sanitizer Multi-action formula - Sanitizer, clarifier & algicide Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack **Brand:** rx clear **Price:** € 76.14 **Availability:** ✅ In Stock ## Summary > 💧 Shock your pool into perfection—because clear water is the new status symbol! ## Quick Answers - **What is this?** Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack by rx clear - **How much does it cost?** € 76.14 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/712880616-rx-clear-mega-shock-73-calcium-hypochlorite-kills-algae-in) ## Best For - rx clear enthusiasts ## Why This Product - Trusted rx clear brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pool-Perfect Safety:** Pre-dilute before adding to avoid liner stains and wait 8-10 hours before swimming. - • **Power-Packed Purity:** 73% calcium hypochlorite delivers a rapid, deep clean for crystal-clear water. - • **Smart Dosing System:** 1 lb per 10,000 gallons for maintenance; double dose to obliterate algae fast. - • **Triple Threat Formula:** Sanitizes, clarifies, and kills algae all in one easy step—pool care simplified. - • **Nighttime Shock Advantage:** Apply after sunset to prevent chlorine loss and maximize effectiveness. ## Overview Rx Clear Mega Shock is a professional-grade pool treatment with 73% calcium hypochlorite, providing a powerful chlorine boost that sanitizes, clarifies, and eliminates algae. Designed for smart, nighttime application, it ensures crystal-clear, algae-free water with easy dosing tailored to your pool size. Trusted by thousands for a safer, cleaner swim experience. ## Description Rx Clear Shock Rx Clear’s Mega Shock contains 73% calcium hypochlorite, yielding 70% available chlorine making it stronger than Super Shock. The components of calcium hypochlorite makes this product similar to household bleach, but with a longer shelf life. Mega Shock is a highly effective multi-purpose product that sanitizes, clarifies and controls algae all in one giving you crystal clear water for a more enjoyable swimming experience. Dosage Add a 1 lb bag per 10,000 gallons of pool water. If you’re trying to kill algae it is recommended you use 2 bags of shock per 14,000 gallons until the algae is dead. Use the following formulas below to find out the number of gallons of water in your pool: Rectangular = Length x Width x Height x 7.5 Round = Diameter x Diameter x Height x 5.9 Oval = Length x Width x Height x 5.9 Our Mission Statement Rx Clear strives to provide quality products for a safer, cleaner, and more enjoyable swimming experience. When it comes to correcting your swimming pool, Rx Clear does it all giving you crystal clear water that fits your needs. Benefits It is best to dilute Mega Shock in a bucket of water before dispensing it around the pool which can prevent liner staining and cloudy water. For the best results use Mega Shock at night in order to prevent the sun from eating up the shock since it is not stabilized; it’s best to shock when the sun isn’t out for maximum performance. Do not swim for 8 to 10 hours after application. Mega Shock has a pH of 11, making this an ideal shock when chlorine levels and pH levels are both down. Test these levels with the appropriate chemical testing kits for pH and chlorine. NOTE: Cannot be sold or shipped to Maine. ## Features - MULTI-PURPOSE - This swimming pool shock works as a strong sanitizer, clarifier, and algicide for clear blue water. - EXTRA POWER - Due to its high percentage of chlorine, Mega Shock is a very effective treatment for a quick chlorine boost. The Rx Clear Mega shock packets are chlorinating essentials. - MIX BEFORE YOU FIX - Add this granular powder to a bucket of water before you begin dissolving it in your pool. Add a 1 lb bag per 10,000 gallons of pool water for smart maintenance. - BEAT THE GREEN - Keep in your swimming pool algae free by adding 2 bags (2 lbs) of shock per 14,000 gallons of pool water. These granules work as an algaecide if your pool needs cleaning, or if you're opening for the season. - WORKS BEST AT NIGHT - Maximize performance by adding this shock to your pool at night. Wait to swim 8 to 10 hours after you start the application. Trust Rx Clear to supply reliable chemicals, supplies, and equipment for your above or in ground pool, spa or hot tub. - NOTE: Cannot be sold or shipped to Maine. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00O92NRGY | | Brand Name | Rx Clear | | Customer Reviews | 4.7 4.7 out of 5 stars (440) | | Item Form | Granular, Powder | | Item Weight | 454 g | | Manufacturer | Rx Clear | | Number of Items | 1 | | Product Benefits | Controls Algae | | UPC | 078399255516 | | Unit Count | 16 Grams | ## Product Details - **Brand:** Rx Clear - **Item form:** Granular, Powder - **Item weight:** 1 Pounds - **Product benefits:** Controls Algae - **UPC:** 078399255516 ## Images ![Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Image 1](https://m.media-amazon.com/images/I/71GOpweKGhL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: What are the ingredients in the package?** A: Don't know but it works great in my vinyl pool. Just make sure you run your filter when you put it in the pool. **Q: Will this suffice for water purification in emergency situations? I understand you have to make sure you get basic Pool Shock with no additives...** A: This stuff was old and rocky and didn’t do good on my pool. **Q: Can this be used for sanitizing drinking water in proper dilution. I have the formula but the recommended product was Ultima which is unavailable.** A: I don't think it's a good idea, I wouldn't try it. **Q: is product safe for vinyl pools?** A: I use it in my vinyl pool and it works great just run your pool filter when you use it. ## Frequently Bought Together - Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Intex 29002E Type A Pool Filter Cartridge Filter Pumps – Easy-to-Clean – Dacron Paper – Efficient Filtration – Two Pack - Clorox Pool&Spa XTRABLUE 3” Chlorinating Tablets, Individually Wrapped, Kills Bacteria & Stops Algae (5 LB) --- ## 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.be/products/712880616-rx-clear-mega-shock-73-calcium-hypochlorite-kills-algae-in](https://www.desertcart.be/products/712880616-rx-clear-mega-shock-73-calcium-hypochlorite-kills-algae-in) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-07-11*