Relax 5kg Granular Shock Chlorine


Hot Tub / Spa / Swimming Pool Chlorine Oxidiser


Have you considered our own brand version of this product?

Castle Hot Tubs Range

Out of stock

Email when stock available


Granular Shock Chlorine – Relax 5 Kg

  • Relax Granular Shock is a fast dissolving and easy to use chlorine shock treatment for swimming pool water eliminating bather wastes, contaminants and algae
  • The high chlorine content of Relax Granular Shock enables you to quickly establish a chlorine level in your pool water
  • These non-stabilised chlorine shock granules are ideal for commissioning new swimming pools or regular oxidation of swimming pool water
  • The 5kg Tub has dosing rates and full directions for use on the packaging

Instructions for using Relax Granular Shock:

Maintain pH levels within the ideal range 7.2-7.6. If the level is not in this range, adjust. Maintain free chlorine residuals within the range 1 – 3 mg/l (ppm).

  1. Pre-dissolve granules in a clean plastic bucket filled with clean, warm pool water, at a maximum rate of 100g of product per 2.2 gallons / 10 litres of water. Add 500g per 45 cubic meters (10,000 gallons) of pool water. Where algae is present, double dose. Always add product to water, not water to product.
  2. Stir well to ensure the product is fully dissolved. Allow product to dissolve for at least 20 minutes before adding to pool water.
  3. Next, ensure that pool circulation pump is running before slowly pouring the solution immediately above the pool return.
  4. Never mix this product directly with other pool chlorine products. Do not pour into a pool skimmer containing chlorine tablets.
  5. Never add this product when the pool is being used. After treatment, wait a minimum of 30 minutes before using the pool.
  6. Wait until chlorine residual has dropped to 3 parts per million before allowing pool to be used.

Confused about your hot tub water chemistry?  Our guides answer the most Frequently Asked Questions!

Why do I need to test my hot tub / spa / swimming pool water chlorine levels?

Why do I need to test my hot tub / spa / swimming pool water pH levels?

When do I need to shock my hot tub / spa / swimming pool water?

A genuine Relax branded product.


Relax Granular Shock 5Kg
– Directions for use –
Click to view full size

Why don’t you try our own brand instead

All of Castle Hot Tubs branded products are Grade ‘A’ quality – packed and labelled in the UK