Description:

Chlorine tablets 250 g are slowly soluble tablets of stabilized chlorine , intended for continuous and uniform disinfection of pool water . Thanks to the slow release of the active substance, chlorine keeps the water clean, safe and hygienic , without affecting the pH and without clogging the filters. The tablets are suitable for all types of pools and liners and are ideal for daily water maintenance throughout the season.

Advantages of chlorine tablets:

• Long-term operation – provides a constant chlorine level for 5-7 days.
• Easy to use – large 250 g tablets allow for easy dosing.
• Stabilized formula – reduces evaporation of active chlorine due to UV rays.
• Does not affect pH – maintains stable water chemistry.
• Universal use – suitable for all types of pools and liners.
• Made in France – quality guaranteed.

Technical features:

• Form: tablets 250 g
• Packaging: 1 kg
• Type: stabilized slow-dissolving chlorine
• Origin: France
• Ideal chlorine level: 1.2 mg/L (acceptable between 0.5–1.5 mg/L)
• Duration of action of one tablet: 5–7 days
• Use: regular, for continuous disinfection

Dosage and use:

• Pool maintenance: 1 tablet / 40 m³ of water / week.
• Place the tablet in the skimmer basket or in the floating dispenser .
• The tablet dissolves gradually and provides continuous disinfection for 5–7 days. ❌ Do not add tablets directly to the liner (foil).

Safety warnings:

• Use biocide with caution – always read the label.
• May aggravate fire (oxidizer).
• Harmful if swallowed, irritating to eyes and respiratory system.
• 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 slow-dissolving chlorine tablets? Because they allow for worry-free, easy and reliable disinfection of your pool , without the need to add chemicals every day. With one tablet, you can have clean water for up to a week .

Hazard classification according to the Chemicals Act

DANGEROUS

• H272 : May intensify fire; oxidizer.

• H302 : Harmful if swallowed.

• H319 : Causes serious eye irritation.

• H335 : May cause respiratory irritation.

• H400 : Very toxic to aquatic life.

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

• EUH031 : Contact with acids liberates toxic gas.

• EUH206 : Warning! Do not use with other products. May release dangerous gases (chlorine).

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

• P102 : Keep out of reach of children.

• P103 : Read instructions carefully before use.

• P210 : Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.

• P220 : Keep away from clothing and other flammable materials.

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

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

• P273 : Avoid release to the environment.

• P280 : Wear protective gloves/eye/face protection.

• P301 + P312 : IF SWALLOWED: Call a POISON CENTER/doctor 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.

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

• P370 + P378 : In case of fire: Use CO₂, powder or water spray for extinction (see also safety instructions for oxidizers).

• P405 : Keep locked up.

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

Same summary

Desjoyaux slow-dissolving chlorine tablets are designed for routine disinfection of pool water and are particularly convenient for regular weekly maintenance. The tablets can be a useful choice for home pool owners who want to easily maintain a stable chlorine level and protect the hygiene of the water, even during periods of increased pool use. When using the product, it is recommended to check the pH value of the water in advance, as this significantly affects the effectiveness of disinfection. The tablets themselves are not intended to solve specific algae problems or for winterizing the pool.

Recommendation source: Enaa guides and team experiences.

User view

Typical users of these slow-dissolving chlorine tablets are owners of domestic or smaller public pools who value routine, reliability and need a simple water maintenance process throughout the season. In practice, the product is particularly practical for anyone who wants to avoid frequent dosing and wants a little more peace of mind during the swimming season - especially in the summer when water hygiene requires more attention.

Desjoyaux is known among users for its comprehensive pool care offering and solutions that are tested and adapted to everyday needs. Pool owners often choose Desjoyaux because it offers a wide range of compatible products and assistance with comprehensive water care.

Why buy at Enaa

At Enaa, you can choose from proven products from the pool care program, and every purchase is accompanied by expert support that helps you compare options for different sizes and types of pools. A special advantage is the clear categorization, which makes it easier to find exactly the right solutions for your type of use.

Answers to frequently asked questions

What size pool are these chlorine tablets suitable for?

Desjoyaux slow-dissolving chlorine tablets 250 g are intended for regular use in most domestic or smaller public swimming pools. The dosage and frequency of use depend on the volume of water, but it is recommended to follow the manufacturer's instructions for the correct dosage in your pool.

Do tablets affect the pH value of water?

Chlorine tablets generally do not cause significant changes in pH values, but for optimal effectiveness, it is advisable to regularly check the pH of the pool water and adjust it if necessary before each disinfection.

How often should I add chlorine tablets?

The frequency depends on the pool load and external conditions. During the summer season or when the pool is used frequently, it is recommended to add the tablet regularly every week or according to the manufacturer's instructions.

Are these tablets enough against algae?

Chlorine tablets effectively disinfect water and help prevent algae growth, but if there is a heavy algae outbreak, we recommend using a dedicated algae agent and following additional pool care tips.

What to do if the water in the pool remains cloudy despite using tablets?

Turbidity in the water may be due to a pH imbalance or the presence of other impurities. In such a case, we recommend that you first measure the basic water parameters, then adjust the dosage or use additional cleaning agents if necessary.

Description updated: April 2026