• 1 ltr bottle of hth Blackal Shock in white bottle with purple lid and blue label on white background
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HTH Blackal Shock 1 Ltr

HTH Blackal Shock 1 Ltr

£33.99
£33.99
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Even if the pool water is disinfected and balanced, other factors can create issues such as cloudy or green water, stains and scale buildup.

Water is not just altered by how often people bathe in it, other altering factors include: wind, atmospheric pollution, insects, the surrounding vegetation and the ambient temperature.

Preventing and curing these problems can involve specialist chemicals that can remove stains, phosphates, algae, grease and other buildups that cannot be managed just by using sanitisers and balancers.

Dosage and Safety

> Before using wait 48 hours after the last shock treatment was added.
> Measure the pH and adjust it to between 7.0 -7.4
> Brush the walls and floor where the algae has developed
> Pour 100ml per 10m³ of water directly into the pool with the filtration running. (ensure no bathers)
> Let the filtration run 24 hours a day until the algae is eliminated
> If necessary, remove the algae debris by vacuuming to waste
> If very cloudy water, after Algae has been destroyed, carry out a floc treatment

HTH Blackal Shock 1 Ltr

HTH Blackal Shock Algaecide is a complex, high dose Copper Based Algaecide. It is specifically designed to destroy chlorine resistant algae, such as Black Algae, Mustard Algae and Pink Algae, without using a chlorine shock treatment. 


HTH Blackal Shock Algaecide is the most effective pool protection from algae that other Brands of swimming pool algicide can not compare to.


> Rebranded From Fi Clor

> Product Innovation

> Very high content of active ingredients (do not overdose the product)

> Incompatible with PHMB and any other product containing copper sulphate

> Slightly foaming 

> Liquid

> Destroys all types of algae, event the most resistant (mustard, black, pink, etc...) and prevents their recurrence

> Easy to use: Graduated container

Warning - this product should not be overdosed: maximum use is once every three months

> Filtration must be on and bathers must be out of the water.

> Do not dilute before use

> Do not mix with other products

> Store in a dry, well ventilated place with temperatures not exceeding 35°C


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