Swimming Pool Chemicals - Blue Horizons 350g Sachet Rapid Shock Granules

£7.50
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  • Blue Horizons Rapid Shock
  • 350g Sachet of Oxidiser - Problem Solver
  • Fast dissolving shock treatment for swimming pools
  • Destruction of non filterable wastes
  • One full sachet raises chlorine by 5ppm per 10,000 gallons (45,545 litres)
  • Recommended for use as a weekly/fortnightly shock dosing, but may also be used to remove excess contamination after heavy use of prolonged good weather.
  • Part of the BOAST system

This Rapid Shock 350g sachet is an oxidised problem solver. Each sachet can treat 10,000 gallons of water and increase chlorine levels by 5PPM. 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. Cascade Pools has a wide range of Blue Horizons chlorine and non-chlorine shock products in tablet, granules and liquid form

  • Blue Horizons Rapid Shock
  • 350g Sachet of Oxidiser - Problem Solver
  • Fast dissolving shock treatment for swimming pools
  • Destruction of non filterable wastes
  • One full sachet raises chlorine by 5ppm per 10,000 gallons (45,545 litres)
  • Recommended for use as a weekly/fortnightly shock dosing, but may also be used to remove excess contamination after heavy use of prolonged good weather.
  • Part of the BOAST system
  • Always follow application and storage instructions on label
  • 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.

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