Bayrol - Chlorilong Classic Bloc 500g - large slow dissolving stabilised chlorine tablet (symclosene)
Bayrol Chlorilong® Classic Bloc 500g
Bayrol Chlorilong® Classic Bloc is a large slow-release chlorine tablet developed for long-term swimming pool disinfection. It steadily releases stabilised chlorine to destroy bacteria, viruses, fungi and organic impurities while helping maintain a consistent disinfectant level.
The 500g block uses Bayrol's A.P.O.® compression technology for slow, even dissolution. It leaves no residue, does not cloud the water and is suitable for pools with all types of filtration systems.
Chlorilong® Classic Bloc is particularly useful at the end of the swimming season or during periods when the pool will not be used regularly. In water below 18°C, one block can provide protection for up to 2 months. During warmer conditions, it can be used every 2–3 weeks, depending on water temperature and filtration time.
Key Features
- Large 500g slow-dissolving chlorine block
- Long-lasting pool disinfection
- Up to 2 months of protection in water below 18°C
- Ideal for winterising and end-of-season care
- Destroys bacteria, viruses and fungi
- Stabilised chlorine for improved UV protection
- Slow, steady release using A.P.O.® technology
- Maintains a consistent chlorine level
- Leaves no residue
- Does not cloud the water
- Boric acid free
- Suitable for all filtration systems
Ideal For
- Winter pool maintenance
- End-of-season treatment
- Long periods between chlorine doses
- Holiday or extended absence cover
- Pools up to 30m³
- Water temperatures below 18°C
How to Use
- Carry out a shock chlorination before adding the block.
- Remove the lid from the Chlorilong® Classic Bloc container.
- Place the complete container directly into the skimmer basket.
- Keep the filtration system running as required for your pool.
- Test the water regularly and maintain the correct chlorine and pH levels.
Do not remove the chlorine block from its container before placing it into the skimmer.
Dosage and Treatment Frequency
| Pool Conditions | Treatment Frequency |
| Water below 18°C | Approximately every 2 months |
| Water above 18°C | Approximately every 2–3 weeks |
One 500g block is suitable for pools up to approximately 30m³. Dissolution time will vary depending on water temperature and filtration running time.
Recommended Water Balance
- pH: 7.0–7.4
- Free Chlorine: 0.5–1.0mg/L
Specifications
| Product | Bayrol Chlorilong® Classic Bloc |
| Product Type | Slow-Release Stabilised Chlorine Block |
| Block Size | 500g |
| Active Ingredient | Symclosene |
| Symclosene Content | 920mg/g |
| Application | Place the container directly into the skimmer |
| Pool Size | Up to approximately 30m³ |
| Filter Compatibility | All filter types |
| Formula | Stabilised and boric acid free |
Important Information
- Never place the chlorine block directly into the pool.
- Keep the block inside its original container during use.
- Avoid direct contact with liners, painted finishes and other delicate surfaces.
- Never mix concentrated pool chemicals.
- Always add chemicals to water, never water to chemicals.
- Use a suitable algaecide alongside the block if additional algae prevention is required.
- Always read the label and product information before use.
Frequently Asked Questions
How long does the Chlorilong® Classic Bloc last?
In water below 18°C, one block can provide protection for up to 2 months. In warmer water, it will usually need replacing every 2–3 weeks.
Can I use it while my pool is open during summer?
Yes. It can be used during the swimming season, although it will dissolve more quickly in warmer water and when the filtration system runs for longer periods.
Where should I place the block?
Remove the lid and place the complete container directly into the skimmer basket. Do not place the bare chlorine block into the pool.
Does it prevent algae?
The block provides long-lasting chlorine disinfection, but Bayrol recommends using a suitable algaecide alongside it for regular algae prevention.
Will it leave residue in the pool?
No. The block dissolves cleanly and will not leave residue or cloud the water when used correctly.
Is it suitable for liner pools?
Yes, provided the block remains in its container and is placed in the skimmer. Direct contact with a liner or painted surface may cause bleaching or damage.
Need advice?
Not sure how to protect your pool over winter or while you're away? Contact our team for help choosing the right long-term chlorine treatment for your pool size and filtration system.
| Restricted Product | No |
|---|---|
| RRP | 11.5 |
