---
product_id: 23495346
title: "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: "$U1840"
currency: UYU
in_stock: true
reviews_count: 8
category: "Rx Clear"
url: https://www.desertcart.uy/products/23495346-mega-shock-73-calcium-hypochlorite-kills-algae-in-swimming-pools
store_origin: UY
region: Uruguay
---

# Nighttime application - Maximize shock efficiency 73% Calcium Hypochlorite - Ultra-strong sanitizer Multi-action formula - Sanitizer, clarifier & algicide 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:** $U1840
**Availability:** ✅ In Stock

## Summary

> 💧 Shock your pool into perfection — clear, clean, and algae-free every time!

## 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 | Single Pack by rx clear
- **How much does it cost?** $U1840 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/23495346-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 Annihilator:** Use 2 lbs per 14,000 gallons to beat stubborn green algae and open your pool season right.
- • **Power-Packed Purity:** 73% calcium hypochlorite delivers a rapid chlorine boost for crystal-clear water.
- • **Smart Dosing Formula:** 1 lb per 10,000 gallons ensures precise, effective maintenance without waste.
- • **Triple-Action Defense:** Simultaneously sanitizes, clarifies, and kills algae to keep your pool pristine.
- • **Nighttime Shock Therapy:** Apply after dark and enjoy safe swimming 8-10 hours later for optimal results.

## Overview

Rx Clear Mega Shock is a premium 73% calcium hypochlorite granular pool treatment that acts as a powerful sanitizer, clarifier, and algicide. Designed for professional-grade pool maintenance, it rapidly boosts chlorine levels, eliminates algae, and clarifies water with precise dosing. Ideal for above or in-ground pools, it works best when applied at night, ensuring your pool stays sparkling and swim-ready with minimal effort.

## Description

desertcart.com : Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack : Patio, Lawn & Garden

Review: Worked for me - Works just as well as Leslie’s 73 cal hypo shock, but cheaper. I was having a problem trying to get my free chlorine level to even register on my test strips. 2lbs of this shock (mixed in a bucket 1 lb at a time) sky rocketed my free chlorine levels. My pic of the pool is a little cloudy due to the chlorine level being high right now, but I’m sure that will resolve itself over the next few days as the levels come down. It’s been crazy 90 degree hot every day around here for a couple of weeks now. The test strip pic is from today, 2 days after I put the shock in a couple of nights ago. Next week if the fc level is low, I’m going to try 1lb instead of 2, and see what happens with the increase in free chlorine levels. If u want a jolt in your free chlorine levels, this stuff works.
Review: Very good product. - Very good product, performed as advertised.

## 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00O92NRGY |
| Best Sellers Rank | #24,895 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #127 in Swimming Pool Chlorine |
| Brand | Rx Clear |
| Customer Reviews | 4.7 4.7 out of 5 stars (640) |
| Is Discontinued By Manufacturer | No |
| Item Form | Granular, Powder |
| Item Weight | 1 pounds |
| Manufacturer | Rx Clear |
| Package Dimensions | 10.35 x 4.13 x 1.57 inches |
| Product Benefits | Kills Algae |
| UPC | 078399255516 |
| Unit Count | 16 Ounce |

## Product Details

- **Brand:** Rx Clear
- **Item Form:** Granular, Powder
- **Item Weight:** 1 Pounds
- **Product Benefits:** Kills Algae
- **UPC:** 078399255516

## Images

![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/81AmEqkKSdL.jpg)
![Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Image 2](https://m.media-amazon.com/images/I/61yRci93A6S.jpg)
![Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Image 3](https://m.media-amazon.com/images/I/71BRe-VzsiL.jpg)
![Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Image 4](https://m.media-amazon.com/images/I/81zuvflWjlL.jpg)
![Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | Single Pack - Image 5](https://m.media-amazon.com/images/I/81oPOW8y4wL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked for me
*by G***N on July 15, 2025*

Works just as well as Leslie’s 73 cal hypo shock, but cheaper. I was having a problem trying to get my free chlorine level to even register on my test strips. 2lbs of this shock (mixed in a bucket 1 lb at a time) sky rocketed my free chlorine levels. My pic of the pool is a little cloudy due to the chlorine level being high right now, but I’m sure that will resolve itself over the next few days as the levels come down. It’s been crazy 90 degree hot every day around here for a couple of weeks now. The test strip pic is from today, 2 days after I put the shock in a couple of nights ago. Next week if the fc level is low, I’m going to try 1lb instead of 2, and see what happens with the increase in free chlorine levels. If u want a jolt in your free chlorine levels, this stuff works.

### ⭐⭐⭐⭐⭐ Very good product.
*by P***S on October 16, 2025*

Very good product, performed as advertised.

### ⭐⭐⭐⭐⭐ 73% Cal FTW!
*by B***Y on July 13, 2025*

FINALLY! Actual chlorine that works. I was using Leslie’s Pool chlorine and Sam’s Club members mark version (not chlorine) and had so many issues with algae and cloudy water. I finally tried this product and have had crystal clear water all year even through storm season. 73% Cal is where it’s at. I wasted hundreds of dollars and tons of time dealing with algae and cloudy nasty water. This is worth its weight in gold.

## 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)

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-17*