Description:

Chlorine tablets weighing approximately 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 slow-dissolving 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: 5 kg (approx. 20 tablets)
• 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 it allows for worry-free, easy and reliable pool disinfection , 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 suitable for regular pool water maintenance, as they provide long-lasting and even disinfection. This type of tablet is particularly useful for weekly or relatively frequent maintenance, when a stable chlorine level is required without constant addition. The product makes the most sense for users who already monitor and regulate the pH of the water and know the basics of pool cleaning and care.

It is less suitable for specific problems, such as heavy algae growth or when preparing the pool for winter dormancy, where targeted solutions are recommended. It is important to always check the pH of the water before use, as chlorine works best in the appropriate pH range.

Recommendation source: Enaa guides and team experiences.

User view

Refilling a pool with chlorine tablets is a common practice among owners of family and garden pools who want to minimize daily worries about water hygiene. Such tablets are most often used by those who already have an established water testing routine and are looking for a customized solution for the gradual release of chlorine without frequent dosing. The stability and predictability of the tablets are especially appreciated by users who want regular and easy maintenance of a clean pool, either throughout the summer or only during increased pool loads.

Desjoyaux is a renowned brand that many users trust for its quality, wide range and tailor-made solutions for various pool maintenance needs - which is why Desjoyaux products are a common choice even for more demanding users.

Why buy at Enaa

At Enaau you can expect a clear range of pool care products, complete with proven solutions for different needs and clear descriptions that make your decision easier. The practical filter “Purpose: Disinfection (chlorine)” allows you to find the right product faster according to your maintenance method.

Answers to frequently asked questions

Are these chlorine tablets suitable for all types of pools?

Chlorine tablets are suitable for most conventional private pools with water where chemical disinfection is permitted. Before use, check the construction of your pool and the manufacturer's instructions, as some surfaces are sensitive to chlorine.

How often is it recommended to add slow-dissolving chlorine tablets?

Typically, one tablet per 25 m³ of water is added every 7-10 days, depending on the frequency of pool use, water temperature and weather conditions. Regularly measure the chlorine and pH levels of the water for optimal results.

What to do if the chlorine tablet does not dissolve evenly or gets stuck in the dispenser?

In this case, check the water flow through the dispenser and remove any obstructions. If the problem persists, consider using another dispensing method or consult a pool professional.

Are these tablets suitable as the only means of eliminating algae?

Slow-dissolving chlorine tablets are primarily intended for basic disinfection. In the case of severe algae growth, also use a special algaecide, as chlorine alone is usually not enough to effectively eliminate large amounts of algae.

Do I always have to check the pH of the water before using the tablets?

Yes, it is recommended to measure the pH of the water before each chlorine dose, as chlorine works best at the correct pH. Inadequate pH can reduce the effectiveness of pool disinfection.

Description updated: April 2026