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5 Best Chlorines of 2025

Last Updated - 07/06/2025

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Blu Line

5 kg Multifunctional 200g large chlorine tablets for swimming pools

Blu Line

£39.99

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Main highlights
- stabilised chlorine
- relax brand for blu line
- Premium Pool chemicals from Blu Line Pool Products
- Multifunctional contains clarifier and algaecide
- Large 200g chlorine tablet
- 5kg pot containing 25 tablets
£39.99
2

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Chemiphase

ChlorForce M15 Liquid Swimming Pool Chlorine – Sodium Hypochlorite – Effective Water Sanitiser & Algae Control – Pool Shock Treatment – 4 x 5 Litres (20L)

Chemiphase

£34.50

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Main highlights
- Regular Pool Maintenance: Perfect for keeping pool water hygienic and free of contaminants.
- Professional Quality: Trusted by pool owners and professionals for reliable performance.
- High-Strength Liquid Chlorine: sodium hypochlorite for efficient pool water sanitization.
- Effective Pool Shock Treatment: Ideal for clearing algae and bacteria, ensuring crystal-clear water.
£34.50
3

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

JOVS INDUSTRIAL CHEMICAL SUPPLIER

JOVS Chlorine Granules 5kg : Stabilized Chemicals for Hot Tubs, Pools, and Spa's - Swimming Cleverness for Rapid Disinfecting and Cleaning, Spa Water Treatment.

JOVS INDUSTRIAL CHEMICAL SUPPLIER

£25.24

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Main highlights
- pH Balance Optimization: Before application, adjust pH levels to the recommended range of 7.2 - 7.6 to enhance bather comfort, protect plants, and ensure efficient chemical usage.
- Versatile Dosing Options: Customize chlorine levels based on water volume with precise dosage recommendations provided. From 1mg/l (ppm) to 3mg/l (ppm), adjust chlorine levels effortlessly for pools of various sizes.
- Startup Dose Recommendation: For freshly filled or drained pools/spas, administer an initial dose of 50mg/l (ppm) of free chlorine, circulated for a minimum of 1 hour, to establish the desired chlorine residual.
- Stabilized Chemical Formula: Formulated with 56% Sodium Dichloroisocyanurate, our chlorine granules provide effective stabilization for maintaining optimal chlorine levels in your water.
- Note: This product is supplied as either a single 5kg container or 5 x 1kg containers, providing you with the same great value.
- Effectively Disinfection: JOVS Chlorine Granule offer rapid disinfecting and cleaning for hot tubs, pools, and paddling pools, ensuring a hygienic environment for your water activities.
- Easy Application: Apply directly to spas with temperatures above 20 degrees Celsius. For lower temperatures or uncertainty, pre-dissolve the granules in water and add the solution while the pump(s) are running.
£25.24
4
Best Value

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Clearwater

Clearwater Chlorine Granules for Hot Tub Spa and Swimming Pool Water Treatment for Rapid Disinfecting and Cleaning, Pail, 5 kg, White

Clearwater

£28.99

£29.99
(3% Off)

More Details
Main highlights
- STABILISE CHLORINE LEVELS: to help ensure your water chlorine level stays between 1-3 mg/litre (ppm) for pools and 3-5 mg/Litre (ppm) for hot tubs
- KILL BACTERIA AND ELIMINATE HARMFUL ORGANISMS: so your spa or pool water stays hygienic and healthy
- FAST DISSOLVING GRANULES: get to work instantly - no more waiting around for hours for tablets to dissolve
- EASY TO FOLLOW INSTRUCTIONS: included with the granules help you select the correct amount to apply for the desired increase in chlorine level
- DISINFECT POOL AND HOT TUB WATER: with these stabilised chlorine granules - free active chlorine (FAC) to maintain a healthy swimming environment
£28.99
£29.99 (3% Off)
5

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

SUDS-ONLINE

SUDS-ONLINE 5KG Stabalised Chlorine Granules - Swimming Pool Chemicals & Spa

SUDS-ONLINE

£24.49

More Details
Main highlights
- Swimming Pools: Routinely use between 2-3ppm residual chlorine in small or domestic pools and 3-5ppm in public or heavily used pools. For each ppm of chlorine increase required use 40g per 25,000 Litres of water.
- Spas and Hot Tubs: To increase the free chlorine level by 2.5ppm, add 5 grams (a teaspoon). On average you should need approx. 1 teaspoon per person using the spa. Maintain a chlorine level of between 2-4ppm and a pH level of 7.2-7.6 in your spa. Re-adjust the pH balance to between 7.2-7.6 for optimum bathing comfort.
- Our chlorine granules are manufactured with a stabilising agent to help prevent the destabilisation and destruction of the chlorine by sunlight and UV rays. This prolongs their usefulness as a sanitiser over other types of non-stabilised chlorine and makes them ideal for use in swimming pools, spas and hot tubs whether located indoor or outdoor. These chlorine granules should be routinely used to help maintain a safe bathing environment.
£24.49

5 Best Chlorines of 2025

5 kg Multifunctional 200g large chlorine tablets for swimming pools

ChlorForce M15 Liquid Swimming Pool Chlorine – Sodium Hypochlorite – Effective Water Sanitiser & Algae Control – Pool Shock Treatment – 4 x 5 Litres (20L)

JOVS Chlorine Granules 5kg : Stabilized Chemicals for Hot Tubs, Pools, and Spa's - Swimming Cleverness for Rapid Disinfecting and Cleaning, Spa Water Treatment.

Clearwater Chlorine Granules for Hot Tub Spa and Swimming Pool Water Treatment for Rapid Disinfecting and Cleaning, Pail, 5 kg, White

SUDS-ONLINE 5KG Stabalised Chlorine Granules - Swimming Pool Chemicals & Spa

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