10 Best Pool Shock in The UK

Last updated on 16/07/2025

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Best Choice

9.8

Exceptional

bluewater POOL & SPA CHEMICALS

Bluewater 5kg Shock Chlorine Granules Swimming Pool & Spa

Why We Love It

Powerful and effective chlorine.
Keeps water crystal clear.
Easy to use packaging.

Main Highlights

✅ High Strength Formula – Contains 65% available chlorine for rapid and effective shock treatment of swimming pools and spas.
💧 Fully Soluble Granules – Dissolves completely in water without residue, ensuring even distribution and ease of use.
🛡️ Powerful Bacteria Elimination – Destroys bacteria, algae, and organic contaminants to keep water safe and sparkling.
⚖️ Neutral pH Balance – Close-to-neutral pH minimizes disruption to water chemistry, helping maintain ideal conditions.
🕒 Perfect for Regular Use – Suitable for weekly or fortnightly maintenance to ensure ongoing water hygiene and clarity.

Deep Blue Shock Chlorine Granules, Fast-Dissolving Treatment for Hot Tubs and Swimming Pools (1Kg)

Why We Love It

Destroys bacteria and algae effectively.
Versatile for hot tubs and pools.
Precise dosing for optimal results.

Main Highlights

POWERFUL SANITISATION: Effectively destroys bacteria, algae and chloramines in hot tubs and spas, ensuring crystal-clear and safe water for optimal enjoyment
VERSATILE APPLICATION: Suitable for both hot tubs and swimming pools the granules work especially well in warm water above 30 degrees
MAINTENANCE SCHEDULE: Regular shock treatment recommended every 2 weeks for routine maintenance, with additional treatments after heavy usage or initial fills
PRECISE DOSING: Small spa (1000 litres) requires 20g for 10mg/l increase, while large spa (1500 litres) needs 30g for the same concentration increase
PROFESSIONAL FORMULA: High-quality granules that dissolve providing swift action and thorough distribution throughout the water for maximum effectiveness

JOVS Non Chlorine Shock 5kg - Spa Treatment for Hot Tubs & Swimming Pools - Water Clarifier, Paddling Reducer, Cleaner, and Pool Maintenance Essential - Included Pool Chemicals.

Why We Love It

Pure sanitization without chlorine.
Odorless comfort and ease.
Effortless application, instant dissolution.

Main Highlights

PURE SANITIZATION WITHOUT CHLORINE: Our Non-Chlorine Shock 5kg ensures pristine water in pools, hot tubs, and spas. Its potent, chlorine-free formula effectively eliminates contaminants and bacteria, delivering crystal-clear water without the need for chlorine.
ODORLESS COMFORT AND EASE: Bid farewell to strong chlorine odors. With our Non-Chlorine Shock 5kg, enjoy an odorless and non-irritating water treatment experience. Breathe easy and relish the pure, sanitized environment without compromise.
EFFORTLESS APPLICATION, INSTANT DISSOLUTION: Simplify water maintenance with quick and easy application instructions. The fast-dissolving formula of Non-Chlorine Shock 5kg ensures efficient distribution, saving you time and effort while maintaining a hygienic aquatic space.
VERSATILE COMPATIBILITY FOR ALL SYSTEMS: Tailored for universal compatibility, Non-Chlorine Shock 5kg seamlessly integrates with chlorine, bromine, and other sanitizing systems. Versatile and effective, it's the ideal choice for any water setup.
ENHANCED ENJOYMENT, MINIMIZED IRRITATIONS: Elevate your aquatic experience with Non- Chlorine Shock 5kg. Besides powerful sanitization, it reduces respiratory irritations, ensuring a safer and more enjoyable environment for all water enthusiasts.

Relax 5kg Shock Chlorine Granules Swimming Pool Chemicals

Why We Love It

Treats cloudy water effectively.
Easy to measure dosage.
Ensures safe pool treatment.

Main Highlights

Precisely graduated shock chlorine for treating cloudy or green water
Normally add 500 g per 10,000 gallons
Never mix pool chemicals together

Clearwater Spa Chemical Starter Kit

25% Off

Why We Love It

Complete hot tub care solution.
Simple usage with provided guide.
Ensures hygienic, pristine water.

Main Highlights

AWARD WINNING STARTER SET: includes everything you need to get started with your Lay-Z-Spa or any other hot tub for hygienic and pristine water
INCLUDES: 500g chlorine, 700 g pH minus 500 g pH plus, 500 ml foam remover, 25 test strips and a dosing guide
EASY TO USE: with simple, easy-to-follow instructions provided in the kit
DISINFECT YOUR HOT TUB: with the fast-acting chlorine granules to keep the water free from bacteria
CONTROL THE PH LEVELS: with the pH PLUS, pH MINUS and Dip Test Strips so you ensure the water is comfortable on your skin
BISHTA APPROVED MEMBER: Clearwater is a BISHTA approved member and recommended by brands such as Bestway and Lay-Z-Spa for reliable, safe and high-quality water treatment
BISHTA APPROVED CHEMICALS: Clearwater is BISHTA approved and recommended by brands such as Bestway and Lay-Z-Spa for reliable, safe and high-quality water treatment

Relax 1kg Granular Shock Treatment Hot Tub Spa Swimming Pool Chlorine Oxidiser

Why We Love It

Effective shock treatment solution.
Ideal for regular maintenance.
Perfect for soft water areas.

Main Highlights

For shock treatment of pool water, and also for regular use pool water in soft water areas
For shock treatment of pool water, and also for regular use pool water in soft water areas

Dirtbusters Pro Pool Algaecide For Swimming Pools & Hot Tubs Concentrate, Powerful Algae Remover & Prevention Treatment For Clean Crystal Clear Water (5L)

Free Shipping

Why We Love It

Prevents algae growth effectively.
Highly concentrated professional treatment.
Restores water to pristine.

Main Highlights

Powerful Pro Pool Prevent Algae Pro Pool Algaecide For Swimming Pools: Effectively Prevents Algae Growth On & Below The Water Surface In Pools & Hot Tubs
Highly Concentrated Professional Treatment: Just 10ml Treats 1000 litres Of Water With Our Super-Concentrated, Professional-Grade Formula. Safe & Effective For All Pool Types
Crystal Clean Clear Water: Our Effective Swimming Pool Clarifier Removes Existing Algae & Restores Cloudy Water Back To Clean & Clear Prisitine Condition
Versatile Use: Our Pool & Hot Tub Chemicals Are Suitable For All Types Of Hot Tubs, Spas, Paddling Pools, & Pools, Making It A Versatile Addition To Your Pool Maintenance Routine
Long Lasting & Easy To Use: Add To Pool Water & Allow The Pumps To Circulate & Distribute The Treatment. Use In Your Swimming Pool Chemicals Kit For A Cleaner Pool All Year Round

JOVS Non-Chlorine Shock 1kg - Spa & Pool Treatment - Chlorine-Free Water Clarifier, Odorless & Irritation-Free, Compatible with Bromine & Chlorine Systems, Pool & Hot Tub Maintenance Essential.

Why We Love It

Odourless and non-irritating treatment.
Effortless and fast dissolution.
Compatible with all systems.

Main Highlights

Chlorine-Free Sanitization: Enjoy pristine, clear water in your pool, hot tub, or spa without the harshness of chlorine. JOVS Non-Chlorine Shock eliminates contaminants and bacteria while leaving water crystal-clear and fresh.
Odorless & Non-Irritating: Say goodbye to strong chlorine odors and skin irritation. This non-chlorine shock treatment offers an odorless and gentle swimming experience, ensuring comfort for all water enthusiasts.
Universal Compatibility: Works seamlessly with all pool and hot tub systems, including chlorine, bromine, and chemical-free systems.
Fast-Dissolving Formula: Simplify water maintenance with our quick-dissolving formula. Easily apply by dissolving the recommended amount in water and adding it directly to your pool or spa.
Reduced Respiratory Irritations: Enjoy a safer, more comfortable water treatment experience with reduced respiratory irritations and enhanced water quality.
Versatile & Effective: Ideal for regular pool and hot tub shock treatment, or when you need to restore water clarity after a high bather load or neglected pool.
Maintenance Made Easy: With regular use every 1-2 weeks, JOVS Non-Chlorine Shock keeps your aquatic space clean and ready for enjoyment.

bluewater POOL & SPA CHEMICALS

Bluewater 500g Shock Chlorine Granules Swimming Pool & Spa Above Ground Paddling Pool Shock Chlorine

Why We Love It

Effective water clarity solution.
Easy to use and apply.
Prevents cloudy pool water.

Main Highlights

500g Bluewater Shock Granules
bluewater POOL & SPA CHEMICALS
Pre-dissolve the granules before adding to the pool/spa to avoid clody water.

SUDS-ONLINE Shock Chlorine Granules 1KG – Fast-Acting Pool & Hot Tub Sanitiser – Stabilised Spa Chlorine Shock Treatment for Swimming Pools, Spas & Inflatable Pools

Why We Love It

Crystal clear water instantly.
Fast sanitation for all pools.
Convenient size for multiple uses.

Main Highlights

Powerful Shock Treatment: Quickly eliminates bacteria, algae, and organic contaminants to keep your pool or spa water crystal clear and safe.
Fast-Acting Formula: Stabilised chlorine granules dissolve rapidly, providing fast sanitation for pools, hot tubs, spas, and inflatable pools.
Easy to Use: Simply add the recommended amount to your water for effective shock treatment without complicated mixing.
Versatile Application: Suitable for all types of pools and spas, including above-ground, inflatable, and in-ground pools.
1KG Convenient Size: Provides multiple treatments, ideal for regular maintenance or seasonal pool cleaning.

8.8

Excellent

We scanned 1268 products

We reviewed these offers relevant to the Pool Shock within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like bluewater POOL & SPA CHEMICALS, Deep Blue, JOVS, Relax, Clearwater, Dirtbusters, SUDS-ONLINE, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Pool Shock in the market, we considered we took a deep dive into 6341 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Bluewater 5kg Shock Chlorine Granules Swimming Pool & Spa. We love many things about this product by bluewater POOL & SPA CHEMICALS. What sets it apart from the competition is Powerful and effective chlorine, Keeps water crystal clear, Easy to use packaging.
The best value product for most shoppers and where user satisfaction is continuously the highest is Deep Blue Shock Chlorine Granules, Fast-Dissolving Treatment for Hot Tubs and Swimming Pools (1Kg) by Deep Blue based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Pool Shock and the best cost-to-value ratio is Clearwater Spa Chemical Starter Kitat Clearwater with a 25% discount.
Our list of the best Pool Shock is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Pool Shock in The UK

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Non Chlorine Shock Granules 1kg Tub - For bromine and chlorine users, oxygenates water and reactivates dormant bromine & chlorine.

AQUASPARKLE Non Chlorine Shock 1kg Hot Tub Pool FOR CHLORINE AND BROMINE USERS

Bluewater 1Kg Shock Chlorine Granules Swimming Pool & Spa…

aBalchemy Non-Chlorine Shock 1kg – Odourless & Irritation-Free, Oxygenates Water, Compatible with Bromine & Chlorine Systems, Spa & Pool Maintenance Essential, Water Clarifier

Non-Chlorine Shock Granules for Hot Tubs & Pools 1kg. For Chlorine or Bromine Users. Sanitises Oxygenates Reactivates dormant Chlorine/Bromine. Can be added directly to tub/pool water

SUDS-ONLINE Non Chlorine Shock 1kg Hot Tubs and Swimming Pools FOR CHLORINE AND BROMINE USERS

We scanned 1268 products

We concluded that: