---
product_id: 51875089
title: "33030CLX Shock Xtra Blue, 30-Pack"
brand: "clorox pool&spa"
price: "£55.12"
currency: GBP
in_stock: true
reviews_count: 5
category: "Clorox Pool&Spa"
url: https://www.desertcart.co.uk/products/51875089-33030clx-shock-xtra-blue-30-pack
store_origin: GB
region: United Kingdom
---

# 30 liquid shock treatments blue algae-killing crystals prevents 3 algae types 33030CLX Shock Xtra Blue, 30-Pack

**Brand:** clorox pool&spa
**Price:** £55.12
**Availability:** ✅ In Stock

## Summary

> 💦 Shock your pool into perfection with Clorox’s blue crystal power!

## Quick Answers

- **What is this?** 33030CLX Shock Xtra Blue, 30-Pack by clorox pool&spa
- **How much does it cost?** £55.12 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/51875089-33030clx-shock-xtra-blue-30-pack)

## Best For

- clorox pool&spa enthusiasts

## Why This Product

- Trusted clorox pool&spa brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Use biocides safely with clear instructions to protect your skin and eyes
- • **Powerful Algae Defense:** Kills green, black & mustard algae for crystal-clear water
- • **Convenient Liquid Formula:** Easy-to-measure liquid shocks for precise dosing every time
- • **Trusted Brand Reliability:** Clorox quality with 7,000+ rave reviews and 4.6-star rating
- • **Perfect for Above-Ground Pools:** Compact 30-pack designed for smaller pools without waste

## Overview

Clorox Pool&Spa Shock Xtra Blue delivers 30 liquid shock treatments formulated with blue algae-killing crystals that effectively eliminate and prevent green, black, and mustard algae. Trusted by thousands with a 4.6-star rating, this product is designed for easy, precise dosing—ideal for above-ground pools—while emphasizing safe use to protect skin and eyes.

## Description

Causes serious eye damage. Causes skin irritation. Use biocides safely. Always read the label and product information before use. Contains blue algae killing crystals Kills and prevents green, black and mustard algae

Review: Costly - Bad quality
Review: Don't advertise a bottle then send me a pouch - Works very well for my above ground pool. Because above ground pools are smaller, having the shock in a bottle, rather than a pouch is very handy as you don't need much product per shock. I just and, for the first time, the seller sent me POUCHES instead of the bottle. Notified desertcart and they made it right. Fortunately, I had kept my last empty shock bottle so I will just refill it. Shock pouches are for large pools that need a full pound (or more) of shock. Sellers: Please do NOT substitute the bottle for a pouch. There's a reason they sell it in a bottle!

## Features

- Causes serious eye damage.
- Causes skin irritation.
- Use biocides safely. Always read the label and product information before use.
- Contains blue algae killing crystals
- Kills and prevents green, black and mustard algae

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00PZZFJQK |
| Brand | CLOROX Pool&Spa |
| Brand Name | CLOROX Pool&Spa |
| Customer Reviews | 4.6 out of 5 stars 7,033 Reviews |
| Item Form | Liquid |
| Item Weight | 454 g |
| Item form | Liquid |
| Item weight | 454 g |
| Manufacturer | CLOROX Pool&Spa |
| Manufacturer Part Number | 33030CLX |
| Model Number | 33020CLX |
| UPC | 810821021616 |
| Unit Count | 30.0 count |
| Unit count | 30.0 count |

## Product Details

- **Brand:** CLOROX Pool&Spa
- **Item form:** Liquid
- **Item weight:** 1 Pounds
- **UPC:** 810821021616
- **Unit count:** 30.0 count

## Images

![33030CLX Shock Xtra Blue, 30-Pack - Image 1](https://m.media-amazon.com/images/I/71BTslaOp7L.jpg)

## Questions & Answers

**Q: Can I use this in an in ground vinyl lined pool? I am concerned it may damage the vinyl liner.**
A: I use it in two different vinyl pools. These are not inground but they are common $500 pools and one of them is actually a hot tub. Absolutely zero stains. This product works great. I'm not totally sure but I'm pretty sure the only thing that's going to stay in your pool is if you leave chlorine tablet on the floor. I did exactly that once by mistake and that chlorine tablet left a 2 ft size white mark. So be careful with your chlorine and that's really it.

**Q: Do you use this before/after or with the Chlorinating tablets?**
A: Hi, We are the manufacturer of Clorox Pool and Spa products. Chlorinating tablets should be used in order to maintain a 1-4ppm residual in the pool. Our shock products are meant to boost the chlorine level to oxidize material that accumulates over time like oils, greases, algae, bacteria, etc. If you're setting up a pool or are trying to clear cloudy water from over the winter, then you can add the shock before having tablets in the pool to eliminate any contaminates that may have accumulated. However, once the pool is crystal clear, then the shock can be added on a weekly basis (with tablets in the pool) to maintain clarity and to prevent contaminate accumulations. If you have any other questions or concerns, please give us a call at 1-800-SOS-POOL.

**Q: Can you use it on vinyl pools**
A: Yes this is the only product I use in my above ground pool and works perfect. No discoloration of pool liner

**Q: Can i use this instead of clorox shock for small pools? the clorox app recommended the latter, but i can't find it in my area.**
A: This is the Clorox shock for small pools this is just the better version in my opinion. I have an index pool and it works fantastic. I use half then wait 24 hrs and test again. Half normally does just fine sometimes I have to add the other half.

## Customer Reviews

### ⭐ Costly
*by N***I on 15 November 2025*

Bad quality

### ⭐⭐⭐⭐⭐ Don't advertise a bottle then send me a pouch
*by D***I on 15 June 2026*

Works very well for my above ground pool. Because above ground pools are smaller, having the shock in a bottle, rather than a pouch is very handy as you don't need much product per shock. I just and, for the first time, the seller sent me POUCHES instead of the bottle. Notified Amazon and they made it right. Fortunately, I had kept my last empty shock bottle so I will just refill it. Shock pouches are for large pools that need a full pound (or more) of shock. Sellers: Please do NOT substitute the bottle for a pouch. There's a reason they sell it in a bottle!

### ⭐⭐⭐⭐⭐ I love this pool shock!
*by U***S on 9 June 2019*

I have a 16 foot above ground with a saltwater system and this pool shock is great for keeping the algea managed as well as opening the pool for the season. I also use it throughout the season as my pool gets used and starts to get behind keeping the water clean as storm water and wind brings things into the pool. Especially in late July as the water gets really warm this helps me stay on top of algae blooms and it has been effective for green as well as mustard algae both of which cause problems where I am. I just bought 10 for this season and it should last me through the season with plenty left over to open the pool next year. Great stuff and the before and after pictures are not fake, I had the same experience this year. I had a pool full of what looked like split pea soup when I took the cover off this Spring and put the shock in and hooked up the filter and ran it overnight after dumping one of these in and the next day It was crystal clear with just dead algae on the bottom to vacuum up. I use a whole one at the start of the season and about half for each shock every couple of weeks as maintenance. My pool is a 16 foot Summerwaves that I converted to an Intex filter and saltwater system.

## Frequently Bought Together

- Clorox Pool&Spa Shock XtraBlue 1 lb
- Clorox Pool&Spa XTRABLUE 3” Chlorinating Tablets, Individually Wrapped, Kills Bacteria & Stops Algae (5 LB)
- Clorox® Pool&Spa™ Swimming Pool Algaecide and Clarifier, Prevents and Treats Pool Algae, Clears Water, 128 Fl Oz (Pack of 1)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-09-17*