Description:

These 20g shock chlorine tablets are fast-dissolving, designed to quickly disinfect and renew pool water . They are ideal for initial pool filling, restarting after winter hibernation or for quick action against algae and green water . The 20g tablets allow for precise dosing , quickly increasing chlorine levels, ensuring clean, clear and safe water . The stabilised formula reduces the evaporation of active chlorine due to UV rays and prolongs the effectiveness of the treatment.

Main advantages:

• Fast acting – effectively destroys algae, bacteria and microorganisms.
• Easy dosing – 20 g tablets for easier and more accurate addition.
• Stabilized formula – reduced chlorine loss due to UV rays.
• Universal use - suitable for all types of pools and liners (foil, concrete, ceramic).
• Made in France – high quality and reliability.

Technical features:

• Form: 20 g tablets
• Packaging: 5 kg
• Type: Stabilized Shock Chlorine
• Origin: France
• Ideal chlorine level: 1.2 mg/L (acceptable between 0.5–1.5 mg/L)
• Usage: occasional (not suitable for regular maintenance)

Dosage and use:

• First pool filling or restart: 4 tablets / 10 m³ of water.
• Elimination of green water: 1 tablet / 1 m³ of water.
• How to use: add tablets to the skimmer basket or floating dispenser. ❌ Do not place tablets directly in contact with the liner.

After shock treatment :

• Let the filtration run continuously for 24–48 hours .
• Bathing is not allowed for at least 24–48 hours (36–48 hours for children).
• Before treatment, remove the protective solar film and robotic cleaners from the pool.

Safety warnings:

• Use biocide with caution – always read the label.
• Causes eye and respiratory tract irritation.
• Very toxic to aquatic organisms.
• Do not mix with other chemicals – it may release dangerous gases (chlorine).
• Keep out of reach of children.

Why choose shock chlorine tablets? Because they provide a quick, effective and easy solution to water problems - from initial pool filling to algae removal. With them, you will always have a clean, hygienic and safe swimming pool .

Hazard classification according to the Chemicals Act

WARNING

• EUH206 : Warning! Do not use with other products. Hazardous gases (chlorine) may be released.

• H302 : Harmful if swallowed.

• H319 : Causes serious eye irritation.

• H335 : May cause respiratory irritation.

• H410 : Very toxic to aquatic life with long lasting effects.

• EUH031 : Contact with acids liberates toxic gas.

• P101 : If medical advice is needed, have product container or label at hand.

• P102 : Keep out of reach of children.

• P103 : Read and follow instructions carefully before use.

• P264 : Wash hands thoroughly after handling.

• P270 : Do not eat, drink or smoke when using this product.

• P271 : Use only outdoors or in a well-ventilated area.

• P273 : Avoid release to the environment.

• P280 : Wear protective gloves, protective clothing, eye protection and face protection.

• P301 + P312 : IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell.

• P305 + P351 + P338 : IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

• P330 : Rinse mouth.

• P337 + P313 : If eye irritation persists: Get medical advice/attention.

• P391 : Contain spillage.

• P403 + P233 : Store in a well-ventilated place. Keep container tightly closed.

• P405 : Keep locked up.

• P501 : Dispose of contents and container to an approved waste collection point in accordance with national regulations.

Same summary

Desjoyaux quick-dissolving shock chlorine tablets are particularly suitable for users who want to quickly and effectively disinfect pool water – whether at the start of the swimming season, after a heavy load on the pool or when water problems suddenly appear. The product is a sensible choice for regular use in households where quick chlorine response without long-term dissolution is important. Users who need a tool for more complex maintenance or combined care (e.g. with algaecides or pH correction preparations) will benefit most from these tablets as part of a wider water care system. The product is not intended for wintering or exclusively for algae removal, so it should be used in accordance with the instructions and in conjunction with a basic water analysis.

Recommendation source: Enaa guides and team experiences.

User view

These chlorine tablets are most often chosen by owners of private small or medium-sized pools who want to quickly clean the water - especially after heavy use or at the start of the sunny season. They are also popular with those who are concerned about regular hygiene and want to prevent the appearance of bacteria and unpleasant odors in the water. Users point out that the larger packaging is practical for the entire season, although we recommend caution when dosing, especially in pools with a variety of equipment.

The Desjoyaux brand is highly trusted, renowned for its many years of experience in pool water maintenance and offering products that users often choose for their proven effectiveness and ease of use.

Why buy at Enaa

You can rest assured when shopping at Enaa, as we enable quick comparison of similar products from the Everything for Pool Cleaning and Care category, and the selection of clearly labeled products is designed to make it easier for users to decide on the purpose and safe use of chemicals in your pool.

Answers to frequently asked questions

Are these chlorine tablets suitable for all types of pools?

The tablets are suitable for most private pools, but we recommend checking the manufacturer's instructions beforehand regarding any material restrictions (e.g. pools with certain liners or filters).

How often should I use shock chlorine tablets?

Shock chlorine tablets are intended for shorter, intensive treatments, for example at the start of the swimming season, after heavy use or when water problems suddenly appear. For regular disinfection, normal use of chlorine is sufficient, shock dosing should be reserved for special cases.

Can I combine shock chlorine tablets with other pool chemicals?

Combination is possible, but it is recommended to follow the correct order; always adjust the pH value first, then add chlorine, and for special needs (e.g. algae) use additional products according to the instructions.

What to do if algae still appears after use?

In the event of persistent algae, we recommend that, in addition to regular disinfection, you change the water, check the filtration and, if necessary, use dedicated algaecides, as chlorine alone is not always sufficient to eliminate all types of algae.

How do I store chlorine tablets to maintain their effectiveness?

Store the tablets in their original packaging, in a dry and cool place, out of the reach of children and protected from direct sunlight and moisture.

Description updated: April 2026