HTH Shock Chlorine Granules – 1.6kg

HTH Shock granular calcium hypochlorite can be used as a regular pool sanitiser, it is especially recommended for pools that are open all year round.

£35.99 inc VAT

In stock

Product reference: 6823 Categories: ,


HTH Shock Chlorine Granules – 1.6kg
Kills all water-borne bacteria with it’s unique fast dissolving action which makes this a very fast acting shock.
HTH Shock granular calcium hypochlorite can be used as a regular pool sanitiser, it is especially recommended for pools that are open all year round.
HTH Shock contains 10% more available chlorine than standard calcium hypochlorite and its fine particle size enables you to dose it directly into the pool rather than pre-dissolve.
It dissolves rapidly to form active free chlorine to kill bacteria and help control algae.
HTH Shock granules contain calcium which helps balance soft water, and it is stabiliser-free so avoiding the problem of ‘chlorine iso-lockout’.
InstructionsCalculate the volume of water in your pool if in doubt refer to the Fi-Clor Swimming Pool Handbook in our downloads section.
The dosage may vary depending upon water conditions, circulation rate, time of day and geographical location. Broadcast the product evenly over a wide area in the deepest part of the pool. Test the water and adjust the dose as necessary.
Dose Rate: 150g per 10m3 will raise the free chlorine by approx 10mg/l (ppm)
The lid can be used to measure 100g, 200g, or 300g – a full lid shock treats 20m3 (20,000 litres or 4,400 Gallons of pool water by raising it 10ppm.
Superchlorinate the water at least every 2 weeks.

Warranty & Returns

This product is fully CE approved, but as a chemical based product returns are restricted, and the means of return have to be approved by us, prior to the item being returned due to the nature of these goods.

Should you require any further information, please email where we will respond to your request quickly.

Stock & Delivery

This product is in stock at our warehouse and is ready for Express or Economy Delivery Service.

Delivery – Mainland UK
Orders placed before 2pm Monday to Friday we aim to dispatch on the same day, after 2pm will be the following working day. This does not include Bank Holidays, which are classed as non-working days. Should you require a Saturday delivery or have any other delivery enquiries, please email who will respond to your request quickly.

Try to include your mobile phone number in the checkout area so that our delivery drivers can contact you should they need any further assistance or clarification in delivering your order.

Please ensure you leave detailed information if your delivery address is hard to find or a new housing development. If you know there is a possibility of missing the delivery, you can at the checkout stage leave instructions for the delivery driver to leave without signature and place your goods with a neighbour or in a discreet place out of sight for your later retrieval.

Please note some areas including Scotland(post codes AB, FK, IV, KW, PA, PH, HS, KA, ZE, TR, DD,PH, PA, KY, AB, DD, KW, IV, HS), Isle of Wight, Isle of Man, will need extra carriage. We no longer ship to Jersey, Guernsey or Northern Ireland.


If you are unable to thoroughly check your delivery upon receipt, sign for it as UNCHECKED. If the package is damaged in any way, no matter how small, please sign for it as DAMAGED. We CANNOT CLAIM from our carriers for any damaged items that have not been signed for as UNCHECKED or DAMAGED.

If you sign for a delivery as OK, which you later find to be damaged, our carriers WILL NOT accept liability and you may be charged for the damaged items, in this case a delivery charge for replacement items WILL be made.