---
product_id: 16725933
title: "Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs."
brand: "coral seas"
price: "A$120"
currency: AUD
in_stock: true
reviews_count: 8
category: "Coral Seas"
url: https://www.desertcart.com.au/products/16725933-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-4-lbs
store_origin: AU
region: Australia
---

# High chlorine concentration for rapid shock Optimized for nighttime application Multi-purpose: boosts chlorine, hardness & pH Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs.

**Brand:** coral seas
**Price:** A$120
**Availability:** ✅ In Stock

## Summary

> 💧 Shock your pool back to life—because clear water waits for no one!

## Quick Answers

- **What is this?** Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs. by coral seas
- **How much does it cost?** A$120 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/16725933-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-4-lbs)

## Best For

- coral seas enthusiasts

## Why This Product

- Trusted coral seas brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safe & Versatile:** Compatible with plaster, fiberglass, vinyl, and saltwater pools.
- • **Nighttime Pool Rescue:** Apply after dark for maximum effectiveness and crystal-clear mornings.
- • **Easy Activation Protocol:** Simply add Yellow Out, wait 5 minutes, then activate with chlorine or oxidizer.
- • **Rapid Algae Annihilation:** Kills all algae strains in 24 hours—no stains, no hassle.
- • **Power-Packed Chlorine Boost:** Super concentrated formula delivers a quick, efficient shock.

## Overview

Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment is a powerful 4 lb powder designed to rapidly eliminate all types of algae while boosting chlorine, water hardness, and pH levels. Safe for all pool surfaces and salt generators, it works best when applied at night and activated with chlorine or an oxidizer, delivering crystal-clear water within 24 hours without harsh chemical stains.

## Description

Yellow Out safely destroys all strains of algae including green, brown, pink and mustard algae in 24 hours without harsh chemicals that can stain or damage the surface of your pool. It dissolves instantly with no brushing required! After adding Yellow Out, an oxidizer must be added to activate this chemical. You can use chlorine, bleach or a non-chlorine shock. Safe on plaster, fiberglass or vinyl pools, as well as pools with salt generators. Directions: Never premix Yellow Out with any other chemicals Add Yellow Out to the pool, wait 5 minutes and add chlorine to the pool 2 lbs treats 15,000 gallons Never premix Yellow Out with chlorine or any other chemicals

Review: Yellow out - Worked great in my pool. Took the yellow out quickly.
Review: Great product! - This actually works amazingly! Use as directed for best results! Had mustard algae that just wouldn’t go away until I used this!

## Features

- MULTI-PURPOSE: Raise the levels for chlorine, water hardness, and pH in your swimming pool giving you crystal clear water.
- INCREDIBLY STRONG: Due to its high percentage of chlorine, Super Shock is very effective and efficient for a quick chlorine boost.
- MIX BEFORE YOU FIX: Add this powder to a bucket of water before you add it to your pool. Add a 1 lb bag per 10,000 gallons of pool water.
- BEAT THE GREEN: Kill the algae in your swimming pool by adding 3 bags of shock per 10,000 gallons of pool water.
- WORKS BEST AT NIGHT: Maximize performance by adding this shock to your pool at night. Wait to swim 8 to 10 hours after application.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002WKF9SO |
| Best Sellers Rank | #11,682 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #75 in Swimming Pool Chlorine |
| Brand Name | Coral Seas |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,210) |
| Item Form | Powder |
| Item Type Name | Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs. |
| Item Weight | 4 Pounds |
| Manufacturer | Coral Seas |
| Product Benefits | Controls Algae |
| UPC | 731524222332 |
| Unit Count | 64.0 Ounce |

## Product Details

- **Brand:** Coral Seas
- **Item Form:** Powder
- **Item Weight:** 4 Pounds
- **Product Benefits:** Controls Algae
- **UPC:** 731524222332

## Images

![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs. - Image 1](https://m.media-amazon.com/images/I/51PiDRkOe3L.jpg)
![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs. - Image 2](https://m.media-amazon.com/images/I/21VapRBRWPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Yellow out
*by G***T on January 18, 2026*

Worked great in my pool. Took the yellow out quickly.

### ⭐⭐⭐⭐⭐ Great product!
*by H***X on December 28, 2025*

This actually works amazingly! Use as directed for best results! Had mustard algae that just wouldn’t go away until I used this!

### ⭐⭐⭐⭐⭐ A quick way to get your pool water under control
*by R***A on February 26, 2026*

Yellow out worked so well and so quickly! This is my new yearly routine.

## Frequently Bought Together

- Coral Seas Yellow Out Swimming Pool Algaecide - 4 lbs.
- Clorox Pool&Spa 12004CLX Chlorine Stabilizer, 4 lb, 4lb

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**Shop now:** [https://www.desertcart.com.au/products/16725933-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-4-lbs](https://www.desertcart.com.au/products/16725933-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-4-lbs)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-21*