Best Granular Swimming Pool Chlorine of 2025

Blue Horizons Shock Chlorine is a powerful calcium hypochlorite product designed to effectively treat your outdoor pool or hot tub. Regular use helps maintain sparkling water by eliminating algae and swimmer waste, ensuring a safe swimming environment. You can conveniently apply it through the skimmer, making it ideal for pools that may have been neglected or experienced heavy bather loads. With a pH level of 11.5, this granular shock chlorine is part of the BOAST system, providing you with routine disinfection and peace of mind.

The Relax Chlorine Shock Treatment is ideal for maintaining crystal-clear pool water. It is designed for shock treatment, making it particularly useful for quickly eliminating contaminants and restoring water quality. Additionally, this product is suitable for regular use in soft water areas, ensuring that your swimming environment remains inviting and hygienic. You will appreciate the convenience of having a reliable chlorine oxidiser that meets your pool's needs, making it easier to enjoy your hot tub or swimming pool without worries.

The CrystalClear Shock Granules are a powerful solution for keeping your hot tub or swimming pool water clean and clear. With a minimum of 70% active chlorine, these granules effectively eliminate algae and bacteria, ensuring your water sparkles. You should use them regularly, ideally every two weeks, or more often in warmer weather. Dissolving the granules in warm water before application helps to ensure they mix well, making it easier for you to maintain optimal pH levels. This product not only disinfects but also prevents swimmer waste from accumulating.

The Bluewater Shock Chlorine is a 2kg granular solution designed for effective pool and spa sanitisation. This product is essential for maintaining clean and clear swimming water, as it helps eliminate bacteria and contaminants. You will appreciate the convenience of using granular chlorine, which dissolves quickly and is easy to apply. With its powerful formulation, you can ensure a safe swimming environment for yourself and your family, enhancing your overall pool experience.

The Blue Horizons Pool Shock is a 5kg granular chlorine product designed for swimming pools. These granules help to effectively sanitise your pool water, ensuring it remains clean and safe for swimming. By using this shock treatment, you can quickly eliminate harmful bacteria and algae, promoting a healthier swimming environment. It's easy to apply, making pool maintenance more convenient for you, so you can spend less time worrying about water quality and more time enjoying your pool.

The CrystalClear Shock Granules are a powerful chlorine solution designed to keep your swimming pool or hot tub sparkling clean. You should use this product every two weeks or more often in hot weather or when the water appears green. These granules effectively eliminate algae and restore clarity to murky water, making it ideal for neglected pools. It is essential to dissolve the granules in warm water before adding them to your pool or hot tub, ensuring they mix thoroughly for optimal results.

The Happy Hot Tubs Shock Pot offers 1kg of granular chlorine shock, ideal for tackling algae and clarity issues in your pool. You can apply it once a fortnight, or more frequently during hot weather, ensuring your water remains clean and inviting. It's also effective for shocking hot tubs, helping to clear dirty or cloudy water quickly. As the UK's number one hot tub chemical retailer, Happy Hot Tubs provides a reliable solution for maintaining the quality of your spa and pool water.