---
product_id: 40673465
title: "Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs."
brand: "coral seas"
price: "€ 43.70"
currency: EUR
in_stock: true
reviews_count: 8
category: "Coral Seas"
url: https://www.desertcart.it/products/40673465-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-2-lbs
store_origin: IT
region: Italy
---

# Fast-acting algae remover Gentle, non-toxic formula Compatible with chlorine generators Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs.

**Brand:** coral seas
**Price:** € 43.70
**Availability:** ✅ In Stock

## Summary

> 💧 Shock your pool back to life—because your weekend deserves crystal clear vibes!

## Quick Answers

- **What is this?** Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs. by coral seas
- **How much does it cost?** € 43.70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/40673465-yellow-out-swimming-pool-chlorine-shock-enhancing-treatment-2-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

- • **Rapid Clarity Boost:** Transforms cloudy, algae-infested water into sparkling blue in just 24 hours.
- • **Safe for All Surfaces:** Non-toxic and gentle on vinyl liners, plaster, and all pool finishes.
- • **Chlorine Generator Friendly:** Seamlessly works with salt and chlorine generator pools without disrupting balance.
- • **Optimized for High pH Pools:** Performs best at pH 7.8+, perfect for modern plaster and saltwater pools.
- • **Effortless Algae Eradication:** No brushing needed—let the formula do the heavy lifting for a pristine pool.

## Overview

Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment is a 2 lb granular formula designed to eliminate stubborn yellow, green, brown, and pink algae. Compatible with chlorine generators and saltwater pools, it works best at higher pH levels (7.8+), making it ideal for modern pool surfaces including plaster and vinyl. Safe, non-toxic, and easy to use without brushing, it rapidly restores pool clarity and freshness, ensuring your pool is party-ready in just one day.

## Description

Use 2 lbs of Yellow Out per 15,000 gallons of water prior to shock treatment with an EPA-registered chlorine that kills yellow algae. Yellow Out works great for all pools, including those with salt chlorine generators and plaster finishes. Both of these circumstances can create a higher pH in pool water (especially newer plaster), which happens to be the ideal condition in which Coral Seas products work. The recommended pH level is 7.8 or higher for ideal performance. This is opposite of traditional algae treatment methods which require a lower pH for chlorine to be more efficient. Yellow Out are also not affected by higher levels of cyanuric acid.

Review: A Must-Have for Texas Pool Owners - iving in Texas, I deal with stubborn dark yellow algae on my pool walls every single year. It doesn't seem to matter how much work I put into keeping the pH and chlorine levels exactly right—the yellow spots always find a way back. This Yellow Out treatment is the only thing that actually works for me. When you follow the shock process described on the bottle, it cleans everything up completely. The best part is that I barely have to brush the walls at all; the chemicals do the heavy lifting, and the pool looks back to new in no time. If you’re tired of fighting mustard algae that won't go away with regular chlorine, this is definitely the solution.
Review: Cleared Up My Pool Just in Time for the Weekend - A few weeks back, I walked out to check the pool and was met with a cloudy, yellowish mess. With family coming over for a Saturday cookout, I needed a quick fix. I picked up Yellow Out, followed the directions, and added it to the pool one evening. By the next day, the difference was incredible. The water was clearer, brighter, and the unpleasant smell was gone. When the weekend rolled around, the kids were cannonballing into sparkling blue water like nothing had happened. What impressed me most is how fast it worked and how little hassle it was — no long waits, no extra complicated steps. It turned what could have been a ruined pool party into a fun, worry-free afternoon.

## Features

- Compatible with pools operating a chlorine generator
- Simple to use, requires no brushing, and cleans up algae gently without the use of harsh chemicals
- Used in conjunction with pool shock to safely remove green, yellow, brown, and pink algae from your pool
- Safe, non-toxic and can be used on all pool surfaces, including vinyl liners

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002WKO6U6 |
| Best Sellers Rank | #9,507 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #63 in Swimming Pool Chlorine |
| Brand | Coral Seas |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,806) |
| Is Discontinued By Manufacturer | No |
| Item Form | Granular |
| Item Weight | 2 pounds |
| Item model number | FBA_YO-2# |
| Manufacturer | Coral Seas |
| Number of Items | 1 |
| Product Benefits | algae |
| Product Dimensions | 6 x 4 x 3.7 inches |
| UPC | 040053230375 |
| Unit Count | 32.0 Ounce |

## Product Details

- **Brand:** Coral Seas
- **Item Form:** Granular
- **Item Weight:** 2 Pounds
- **Product Benefits:** algae
- **UPC:** 040053230375

## Images

![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs. - Image 1](https://m.media-amazon.com/images/I/41LBajIsAwL.jpg)
![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs. - Image 2](https://m.media-amazon.com/images/I/41Y7p6DikGL.jpg)
![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs. - Image 3](https://m.media-amazon.com/images/I/51+QhkO01YL.jpg)
![Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs. - Image 4](https://m.media-amazon.com/images/I/51PiDRkOe3L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Must-Have for Texas Pool Owners
*by F***O on January 7, 2026*

iving in Texas, I deal with stubborn dark yellow algae on my pool walls every single year. It doesn't seem to matter how much work I put into keeping the pH and chlorine levels exactly right—the yellow spots always find a way back. This Yellow Out treatment is the only thing that actually works for me. When you follow the shock process described on the bottle, it cleans everything up completely. The best part is that I barely have to brush the walls at all; the chemicals do the heavy lifting, and the pool looks back to new in no time. If you’re tired of fighting mustard algae that won't go away with regular chlorine, this is definitely the solution.

### ⭐⭐⭐⭐⭐ Cleared Up My Pool Just in Time for the Weekend
*by G***I on September 23, 2025*

A few weeks back, I walked out to check the pool and was met with a cloudy, yellowish mess. With family coming over for a Saturday cookout, I needed a quick fix. I picked up Yellow Out, followed the directions, and added it to the pool one evening. By the next day, the difference was incredible. The water was clearer, brighter, and the unpleasant smell was gone. When the weekend rolled around, the kids were cannonballing into sparkling blue water like nothing had happened. What impressed me most is how fast it worked and how little hassle it was — no long waits, no extra complicated steps. It turned what could have been a ruined pool party into a fun, worry-free afternoon.

### ⭐⭐⭐⭐⭐ The algae and algae stains are gone!
*by D***R on September 23, 2025*

I can't even begin to put in words how well this worked on my inground pool. We have been fighting very aggressive green algae, and algae stains, all season to the point where the shallow end and much of the sides had ongoing algae or algae stains. I used the Clorox algaecide & clarifier several times. It helped for a day or two but it never really got rid of the algae, and especially the stains. Honestly, I had all but given up when I read the reviews on Yellow Out. Per instructions, I vacuumed the entire pool with a vacuum brush (no wheels), the next day I swept it and added 4 lbs of Yellow Out to my 33,000 pool and the next day I shocked it with chlorine. It has been five days now. THERE IS ABSOLUTELY NO TRACE OF ALGAE, OR ALGAE STAINS IN OUR POOL ANYMORE! Simply amazing.

## Frequently Bought Together

- Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment - 2 lbs.
- HTH 52037R Pool Care Shock Advanced, Swimming Pool Chemical - Cal Hypo Formula, Prevents Bacteria & Algae, Restores Crystal Clear Water - Shock Treatment, 1lb (12 Pack)
- PoolRX+ pool unit 7.5k-20k gallons

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-30*