--- product_id: 741604042 title: "Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 12 Pack" brand: "rx clear" price: "R5290" currency: ZAR in_stock: true category: "Rx Clear" url: https://www.desertcart.co.za/products/741604042-mega-shock-73-calcium-hypochlorite-kills-algae-in-swimming-pools store_origin: ZA region: South Africa --- # Multi-purpose sanitizer, clarifier & algicide Nighttime application for max effectiveness 73% Calcium Hypochlorite - Ultra concentrated power Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 12 Pack **Brand:** rx clear **Price:** R5290 **Availability:** ✅ In Stock ## Summary > 💧 Shock your pool into perfection—because clear water is the new status symbol. ## Quick Answers - **What is this?** Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 12 Pack by rx clear - **How much does it cost?** R5290 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/741604042-mega-shock-73-calcium-hypochlorite-kills-algae-in-swimming-pools) ## 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 - • **Algae Defense Mode:** Double dose keeps your pool green-free and sparkling, perfect for seasonal openings or quick cleanups. - • **Triple-Action Formula:** Sanitizes, clarifies, and kills algae in one powerful treatment—your all-in-one pool hero. - • **Optimized Nighttime Use:** Apply after dark and enjoy safe swimming in 8-10 hours—maximize results while you rest. - • **Ultra-Concentrated Chlorine Power:** 73% calcium hypochlorite delivers a rapid, deep clean for crystal-clear water. - • **Precision Dosing for Smart Maintenance:** 1 lb per 10,000 gallons ensures efficient, cost-effective pool care without guesswork. ## Overview Rx Clear Mega Shock is a premium 73% calcium hypochlorite granular treatment designed to sanitize, clarify, and eliminate algae in swimming pools. Ideal for above or in-ground pools, it offers fast-acting, multi-purpose pool care with easy dosing instructions and optimal nighttime application for maximum effectiveness. ## Description A powerful, highly dense chlorinated shock treatment that will remove the green algae from your swimming pool water by just following the recommended dosage of this product. Be sure to pre-dissolve this powdered substance in a bucket of water before dispensing it around the perimeter of your swimming pool while your pump is running. 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 | B00O92NRGO | | 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 | | Manufacturer Part Number | 20406312 | | Product Benefits | Controls Algae | | UPC | 617215599535 | | Unit Count | 192.0 Grams | ## Product Details - **Brand:** Rx Clear - **Item form:** Granular, Powder - **Item weight:** 1 Pounds - **Product benefits:** Controls Algae - **UPC:** 617215599535 ## Images ![Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 12 Pack - Image 1](https://m.media-amazon.com/images/I/712aio0OaXL.jpg) ## Available Options This product comes in different **Color** options. --- ## 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.co.za/products/741604042-mega-shock-73-calcium-hypochlorite-kills-algae-in-swimming-pools](https://www.desertcart.co.za/products/741604042-mega-shock-73-calcium-hypochlorite-kills-algae-in-swimming-pools) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-06-30*