Swimming Pool Chemicals - Granular Shock

£9.95
In Stock Icn Tick
  • Granular Shock.
  • This product helps to prevent and remove algae.
  • Destroys swimmer wastes and may be used for regular disinfection.
  • Available in 1kg, 2kg and 5kg containers.
  • Please see drop down box for prices.

'Blue Horizons' - The brand you can trust. These non stabilised chlorine granules are ideal for shock dosing or regular oxidisation of swimming pool & spa water. They may also be used for routine swimming pool disinfection. By ‘shocking’ your pool you actually increase the chlorine level. The purpose of this is to raise the chlorine level to remove bacteria or any organic matter from the water. This process should occur weekly, in peak use it should be shocked more regularly. Using tablets that release chlorine slowly does not provide your pool with sufficient amounts of chlorine to shock the water. Unlike chlorine based shock, where you cannot go into the pool until the chlorine levels have returned to a safe level, with non-chlorine based shock there is only a short wait before you can return to the pool.

  • This product helps to prevent & remove algae and destroy swimmer wastes
  • May be used for regular disinfection
  • ph 11.5
  • Application Instructions: Maintain pH levels within the ideal range of 7.2 - 7.6 and maintain free chlorine residuals routinely in the 1-3 mg/l (ppm) range. Shock or oxidising procedures are recommended either weekly or fortnightly with a maximum of 10 mg/l (ppm) for a full shock treatment.
  • Pre-dissolve this product in a clean plastic container at a maximum rate of 100g per 10 litres (2.2 gallons) of warm water. Stir well to the ensure the granules are fully dissolved. Add the resulting solution to the pool whilst the pump(s) are turned 'on' preferably near the water inlets to aid distribution.
  • After using the shock granules the pool water may become temporarily cloudy so keep the filtration pump running until it clears.
  • After shock treatment procedures allow the chlorine to drop below 5ppm before bathing recommences, and in any event wait for at least 30 minutes before bathing recommences.
  • IMPORTANT: Wear eye and face protection and ensure granules are not blown back into your face.
  • NEVER MIX WITH ANY OTHER CHEMICALS INCLUDING CLEANING AND CHLORINE PRODUCTS AS A DANGEROUS REACTION MAY OCCUR
  • PLEASE READ THE FULL INSTRUCTIONS ON THE PACKAGING PRIOR TO USING THIS PRODUCT
  • Please view our winter pool guide for information on how to winterise and care for your pool over the winter.      
  • Guide Thumb

    How to treat green water

    Find out all you need to know about algae and green water, how to treat it and how to cure it.

Returns Policy


Your rights to return goods are protected under the EU Distance Selling Directive.

You are entitled to cancel your order and return the goods within 7 working days for a full refund not including the cost of delivery. Do this by contacting us by email or telephone and quoting the order number supplied to you. Your refund will be paid within 30 days. You are responsible for the cost and risk of loss or damage when returning the goods, so you should take out enough postal insurance to cover their value. This cancellation policy does not affect your rights when we are at fault - for example, if goods are faulty or incorrectly-described.

Exclusions: Bespoke items (made to measure items) are not included and cannot be returned. If a bespoke item is faulty then the product warranty /guarantee will take effect.

Any goods returned should be in saleable condition.

These terms apply to your order. We may change our terms and conditions at any time, so please do not assume that the same terms will apply in the future.

None of these terms affect your legal rights and these are not diminished in any way. If any term is held to be invalid under any applicable statute or rule of law, that term is automatically omitted from the terms to minimum extent necessary to comply with the law and without affecting the validity or enforceability of the remainder.

You may also want to consider

  1. Non Chlorine Shock

    Swimming Pool Chemicals - Blue Horizons Non Chlorine Shock Granules

    • Chlorine Free Shock Granules
    • Restores water sparkle
    • Destroys swimmer wastes
    • Ideal for regular oxidisation
    from £13.95
  2. Kleen Pool Algaecide

    Swimming Pool Chemicals - Kleen Pool Longlasting Algaecide

    • Just ONE TREATMENT will keep your pool clear from algae for up to six months
    • Save £££'s with this product
    • One litre treats up to 6200 gallons
    • Spring or Winter treatment
    £9.95
  3. Blue Horizon Ultimate Winter Time Long Life Algaecide 5L

    Swimming Pool Chemicals - Blue Horizons Ultimate Winter Long Life Algaecide 5L

    • Long Life Winter Algaecide 
    • 5 litres treats upto 15,000 gallons
    • Copper free winter algaecide
    • Prevents staining & scale build-up
    • Chlorine & Bromine compatible
    £24.95