The Piscimar PM-420 Actibon Shock is a liquid oxidation catalyst and shock activator for swimming pools, designed to help recover green water and boost the effectiveness of chlorine, bromine or active oxygen. It is particularly useful when your regular disinfection routine is no longer keeping up, or when chlorine has lost its punch due to high cyanuric acid (stabiliser) levels in the water.
What the Piscimar PM-420 Actibon Shock is used for
Green water does not always mean you need to dump in more chlorine. Sometimes the disinfectant is already present but is being blocked by excess stabiliser, algae load, or the aftermath of a heavy storm. The Piscimar PM-420 Actibon Shock works as a catalyst that reactivates your existing disinfectant, helping it do the job it should already be doing.
Typical situations where it makes sense: pool water that has turned green after a storm or a period of neglect, heavy bather load that has overwhelmed the disinfection system, or persistently high cyanuric acid levels that are locking up free chlorine. In all these cases, adding more disinfectant alone often fails – the Actibon Shock helps break the deadlock.
Unlike a straight chlorine shock, this product does not replace your disinfectant. It amplifies its action. Think of it as a booster rather than a substitute.
Dosage and application guide for Piscimar Actibon Shock
Before applying the Piscimar PM-420 Actibon Shock, check that the pool water pH sits between 7.2 and 7.6. Treatment works best within this range, and applying at the wrong pH wastes product.
Key point before you start: Actibon Shock must always be used alongside your pool disinfectant – chlorine, bromine or active oxygen. It is a catalyst and activator, not a standalone disinfectant. Without a disinfectant present in the water, it cannot do its job.
Recommended doses
- Shock treatment / initial dose: 0.5 L per 100 m³ of pool water.
- Maintenance in pools with high stabiliser levels: 0.2 L per 100 m³, once per week.
Step-by-step application
- Test and adjust the pH to 7.2-7.6 before doing anything else.
- Check your disinfectant level and top up if needed – the Actibon Shock needs something to activate.
- Pour the Actibon Shock directly into the pool, distributing it evenly across the water surface.
- Keep the filtration running throughout the treatment to circulate the product around the entire pool.
- Retest the water parameters before applying any further treatments.
Important: in salt electrolysis pools, bypass or switch off the chlorinator cell during treatment – the product must not pass through it. Actibon Shock is not compatible with biguanide (PHMB) treatments.
What to expect after applying Piscimar Actibon Shock
Once applied, the Piscimar PM-420 Actibon Shock gets to work quickly. Piscimar states that green water recovery can be achieved within 5 hours under the right conditions – meaning pH is correct, filtration is running, and a disinfectant is present in the water.
Real-world results depend on how green the water is, how well the filter is performing, and whether the underlying cause has been addressed. A pool that turned green overnight after a storm will typically respond faster than one that has been neglected for weeks.
After treatment: keep the filter running and recheck pH, chlorine and stabiliser levels before declaring the pool clear. If cyanuric acid is above 75 ppm, partial water replacement may still be necessary – no product can fully compensate for severely over-stabilised water.
Actibon Shock accelerates recovery, but it is not a shortcut around proper water balance. Regular testing and maintenance remain essential once the crisis is resolved.
Why choose Piscimar Actibon Shock for green water recovery
When the pool has gone green and the usual shock treatment is not cutting through, the Piscimar PM-420 Actibon Shock offers a targeted solution rather than a blanket chemical overload.
It is especially well suited to pools in the UK where outdoor temperatures and variable weather through the May-September season can cause rapid algae blooms, or where stabiliser has built up over successive seasons of trichlor tablet use.
- Accelerates shock treatments for faster green water recovery.
- Boosts the action of chlorine, bromine or active oxygen.
- Specifically formulated for pools with high cyanuric acid / stabiliser levels.
- Liquid formula – distributes evenly without pre-dissolving.
- Compatible with salt electrolysis pools when the chlorinator cell is bypassed.
It is not a disinfectant replacement. Use it as a catalyst alongside your normal treatment programme, with water parameters in check and the filter running throughout.
Why buy Piscimar Actibon Shock from Pools&More
Pools&More stocks the Piscimar PM-420 Actibon Shock as an authorised Piscimar distributor, with specialist knowledge of pool water treatment and green water recovery.
If you are unsure whether Actibon Shock is the right product for your situation – or how to use it alongside your existing treatment – the Pools&More team can help you work through it before and after purchase.
Expert support: questions about dosage, pH correction, cyanuric acid levels, salt electrolysis compatibility or shock treatment sequencing? Our team is here to help you get it right first time.
- Authorised Piscimar distributor.
- Specialist pool water treatment advice.
- Pre- and post-purchase support.
- Focused on helping you recover your pool water fast.
Frequently asked questions
What does the Piscimar PM-420 Actibon Shock actually do?
It acts as a catalyst that reactivates and boosts your pool disinfectant – chlorine, bromine or active oxygen – helping to recover green water and restore water clarity. It is not a disinfectant itself, but a treatment accelerator used alongside one.
Is Actibon Shock the same as a chlorine shock treatment?
No. Actibon Shock is a liquid catalyst, not a chlorine shock. It works by amplifying the action of whatever disinfectant is already in your pool water. You still need chlorine, bromine or active oxygen present for it to work.
Will Actibon Shock clear a green pool?
Yes, it is designed for exactly that. It is most effective when the green water is caused by a disinfectant shortfall, a storm, heavy use, or high stabiliser levels blocking the chlorine. Piscimar states recovery within 5 hours under the right conditions.
How much Actibon Shock do I need to use?
For a shock dose or initial treatment, use 0.5 L per 100 m³ of pool water. For ongoing maintenance in pools with persistently high stabiliser levels, use 0.2 L per 100 m³ once a week.
Do I need to adjust the pH before applying?
Yes. The water pH should be between 7.2 and 7.6 before you apply Actibon Shock. Treating outside this range reduces effectiveness, so test and correct the pH first.
Does it work when cyanuric acid (stabiliser) levels are high?
Yes – that is one of its core use cases. Actibon Shock is formulated to help reactivate chlorine in pools where high stabiliser levels are blocking disinfection. However, if cyanuric acid exceeds 75 ppm, partial water replacement is also recommended.
Can I use Actibon Shock in a salt electrolysis pool?
Yes, with one important condition: the product must not pass through the chlorinator cell. Bypass or switch off the electrolysis unit during treatment, then recheck water parameters before returning to normal operation.
Is Actibon Shock compatible with biguanide (PHMB) treatments?
No. The Piscimar PM-420 Actibon Shock is not compatible with biguanide-based pool treatments. If your pool uses a PHMB system, do not use this product.
How do I apply Piscimar Actibon Shock?
Pour the measured dose directly into the pool water, spreading it evenly across the surface. Keep the filtration system running throughout the treatment to ensure the product circulates properly around the entire pool.
Does Actibon Shock replace my regular pool treatment routine?
No. It is a booster for shock treatments, not a substitute for regular disinfection, pH control or water maintenance. Once your pool has recovered, return to your normal treatment programme to keep it that way.
| Weight | N/A |
|---|---|
| ACTIBON SHOCK | 0,5L, 1L |
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