---
product_id: 16725933
title: "Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs."
brand: "coral seas"
price: "357.53 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Coral Seas"
url: https://www.desertcart.tn/products/16725933-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-4-lbs
store_origin: TN
region: Tunisia
---

# 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:** 357.53 DT
**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?** 357.53 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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: Works very well, follow the directions - this product really works on pools that get a greenish tint with light green alge starting on the walls. I was out of town for 3 weeks and it must have rained 12 inches while I was gone. The person watching the house told me the pool was looking suspicious so I told them to dump some shock in it; I was getting back in a few days. The pool was turning green and there was some light algae on the walls that wouldn't brush off. I put 2 lbs. of Yellow Out in the pool and immediately followed it with 2 lbs. of shock. I followed it up with another lb. after 12 hours. the next day the green tint was gone as well as the algae. The pool was a little murky; it took a couple of days for the filter to clean it up; I had to backwash once during the cleanup to get it back to glass- clear.
Review: Must-Have for Pool Algae! - This stuff works every time for algae in our pool! Whenever the water starts turning or algae shows up, this helps clear it up quickly when used with shock. It’s become a must-have pool product for us, especially during the hot summer months. Definitely recommend keeping it on hand!

## 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 | #9,131 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #90 in Swimming Pool Chlorine |
| Brand | Coral Seas |
| Brand Name | Coral Seas |
| Customer Reviews | 4.4 out of 5 stars 2,236 Reviews |
| Item Form | Powder |
| Item Type Name | Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 4 lbs. |
| Item Weight | 4 pounds |
| Manufacturer | Coral Seas |
| Manufacturer Part Number | YO-4# |
| Model Number | YO-4# |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Benefits | Controls Algae |
| UPC | 731524222332 |
| Unit Count | 64 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

### ⭐⭐⭐⭐⭐ Works very well, follow the directions
*by D***S on July 23, 2025*

this product really works on pools that get a greenish tint with light green alge starting on the walls. I was out of town for 3 weeks and it must have rained 12 inches while I was gone. The person watching the house told me the pool was looking suspicious so I told them to dump some shock in it; I was getting back in a few days. The pool was turning green and there was some light algae on the walls that wouldn't brush off. I put 2 lbs. of Yellow Out in the pool and immediately followed it with 2 lbs. of shock. I followed it up with another lb. after 12 hours. the next day the green tint was gone as well as the algae. The pool was a little murky; it took a couple of days for the filter to clean it up; I had to backwash once during the cleanup to get it back to glass- clear.

### ⭐⭐⭐⭐⭐ Must-Have for Pool Algae!
*by D***N on May 21, 2026*

This stuff works every time for algae in our pool! Whenever the water starts turning or algae shows up, this helps clear it up quickly when used with shock. It’s become a must-have pool product for us, especially during the hot summer months. Definitely recommend keeping it on hand!

### ⭐⭐⭐⭐⭐ Works great, used for years
*by T***D on August 29, 2024*

I went on a vacation and my pool person had a medical emergency, no one touched the pool for 6 days. I have a huge tree over the pool, and live in AZ, temps were 110 every day. When I returned, around noon, The Pool had thousands of leaves in it, I could not see bottom, water was an iridescent green. Pretty much the nightmare I expected. But I had my secret weapon ready. I got out all the leaves I could, added 1.4 lbs of yellow out (distributed across the pools service). Let pump run at full for 5m, added 2lbs shock and went inside (trying not to look at my poor pool). By 5pm I could see the bottom, it still had a green tinge to it. I got in and got all leaves off the bottom (took over an hour). But now it was really looking better. I let pump run over night. Next morning clear water, still a little green but what a difference. I back washed about noon. Added clarifier and another pound of shock. By 5pm it was 99% perfect. I felt so much better. This stuff is like an alge eraser when used with shock. I try to always keep it on hand, just in case a problem arises.

## 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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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-31*