--- product_id: 65172295 title: "Granular Shock Chlorine Tub of 5 Kg- Blue Horizons" brand: "blue horizons" price: "Β₯36426" currency: JPY in_stock: true reviews_count: 8 url: https://www.desertcart.jp/products/65172295-granular-shock-chlorine-tub-of-5-kg-blue-horizons store_origin: JP region: Japan --- # Powerful algae & bacteria control 5 Kg high-concentration granules Optimal pH 7.2-7.6 balance Granular Shock Chlorine Tub of 5 Kg- Blue Horizons **Brand:** blue horizons **Price:** Β₯36426 **Availability:** βœ… In Stock ## Summary > πŸ’§ Shock it. Clear it. Own your pool’s glow-up. ## Quick Answers - **What is this?** Granular Shock Chlorine Tub of 5 Kg- Blue Horizons by blue horizons - **How much does it cost?** Β₯36426 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/65172295-granular-shock-chlorine-tub-of-5-kg-blue-horizons) ## Best For - blue horizons enthusiasts ## Why This Product - Trusted blue horizons brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Easy & Safe Application:** Pre-dissolve granules for quick dispersion near water inlets; filtration clears haze fast post-treatment. - β€’ **Precision pH & Chlorine Control:** Formulated to maintain ideal pH (7.2-7.6) and free chlorine residuals (1-3 ppm) for safe, balanced water. - β€’ **Bulk 5 Kg Tub for Long-Term Care:** Generous size supports multiple shock treatments, perfect for serious pool and hot tub managers. - β€’ **Maintain Crystal Clear Water All Season:** Routine bi-weekly treatments keep algae and swimmer waste at bay, even in peak heat. - β€’ **Shock Your Pool to Sparkling Perfection:** Highly concentrated calcium hypochlorite formula delivers rapid and effective pool sanitation. ## Overview Blue Horizons Granular Shock Chlorine is a 5 kg tub of highly concentrated calcium hypochlorite granules designed for professional-grade pool and hot tub maintenance. It effectively controls algae, destroys swimmer waste, and maintains optimal pH and chlorine levels for crystal-clear, safe water. Ideal for routine bi-weekly shock treatments or emergency algae remediation, this product ensures your aquatic space stays pristine and inviting all year round. ## Description Product description Blue Horizons Granular Shock Chlorine, a calcium hypochlorite granular shock chlorine, can be used to winterise your outdoor pool or hot tub. Granular Shock Chlorine is a highly concentrated chlorine that is used to shock your swimming pool or hot tub water on a regular basis. This should be done every two weeks or more frequently during hot weather or if the water in your pool or hot tub turns green. Directions 1- Keep pH levels within the optimal range of 7.2-7.6. If the level does not fall within this range, make adjustments. 2- Keep free chlorine residuals in the 1–3mg/l (ppm) range. Shock or oxidising operations should be performed weekly or fortnightly, with a maximum of 10mg/l (ppm) for a complete shock treatment. 3- Pre-dissolve this product in a clean plastic container at a maximum of 100g per 2.2 gallons (10 litres) water. Stir well to ensure that the substance is completely dissolved. Add the resulting solution to the pool or hot tub while the pump is turned on, preferably near the water inlets for better dispersion. 4- Repeat the dose/application as needed to obtain the target level. 5- After using this product, the pool or hot tub water may become briefly hazy; keep the filtration pump running until it clears. 6- After shock treatment, wait at least 30 minutes for the chlorine level to decrease below 5mg/l before bathing again. Always test your water after dosage and before bathing. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Safety Warning Pre-dissolve this product in a clean plastic container at a maximum of 100g per 2.2 gallons (10 litres) water. After shock treatment, wait at least 30 minutes for the chlorine level to decrease below 5mg/l before bathing again. Always test your water after dosage and before bathing. Keep pH levels within the optimal range of 7.2-7.6. See more ## Features - Versatile Pool and Hot Tub Treatment: Blue Horizons Granular Shock Chlorine, a calcium hypochlorite granular shock chlorine, can be used to winterise your outdoor pool or hot tub - Regular Maintenance Schedule: Granular Shock Chlorine is a highly concentrated chlorine that is used to shock your swimming pool or hot tub water on a regular basis. This should be done every two weeks or more frequently during hot weather or if the water in your pool or hot tub turns green - Effective Algae Control: Granular Shock Chlorine is highly effective at ridding sparkling water of algal infestation. Granular Shock Chlorine can be applied using the skimmer. Also use this product if the pool or hot tub has been neglected, if algae has grown on the pool or hot tub's floors and walls, or if there has been an unusually high bather load - Product Specifications: Equivalent to Shock Xtra and Rapid Shock. Helps to prevent and remove algae. Destroys swimmer waste. It can be used for routine disinfecting. pH 11.5. Part of the BOAST system - pH Level Management: Keep pH levels within the optimal range of 7.2-7.6. If the level does not fall within this range, make adjustments. Keep free chlorine residuals in the 1–3mg/l (ppm) range. Shock or oxidising operations should be performed weekly or fortnightly, with a maximum of 10mg/l (ppm) for a complete shock treatment - Application Instructions: Pre-dissolve this product in a clean plastic container at a maximum of 100g per 2.2 gallons (10 litres) water. Stir well to ensure that the substance is completely dissolved. Add the resulting solution to the pool or hot tub while the pump is turned on, preferably near the water inlets for better dispersion - Post-Application Guidelines: After using this product, the pool or hot tub water may become briefly hazy; keep the filtration pump running until it clears. Repeat the dose/application as needed to obtain the target level - Safety Precautions: After shock treatment, wait at least 30 minutes for the chlorine level to decrease below 5mg/l before bathing again. Always test your water after dosage and before bathing - Large 5 Kg Container: This tub contains 5 kilograms of granular shock chlorine, providing sufficient quantity for multiple treatments and long-term pool or hot tub maintenance needs ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00L8PGRV2 | | Benefits | Controls Algae | | Best Sellers Rank | 9,998 in Garden (See Top 100 in Garden) 68 in Chlorine | | Brand Name | Blue Horizons | | Customer Reviews | 4.6 4.6 out of 5 stars (214) 4.6 out of 5 stars | | Item Form | Granular | | Item Highlight | alcium hypochlorite granular shock chlorine | | Item Type Name | Granular Shock Chlorine | | Item Weight | 5 Kilograms | | Manufacturer | CPC | | Manufacturer Part Number | BWP431-5 | | Number Of Items | 1 | | Unit Count | 5000 gram | ## Product Details - **Brand:** Blue Horizons - **Item weight:** 5 Kilograms - **Item form:** Granular - **Product benefits:** Controls Algae - **Number of items:** 1 ## Images ![Granular Shock Chlorine Tub of 5 Kg- Blue Horizons - Image 1](https://m.media-amazon.com/images/I/71H1fC5alfL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Used to Remove BLACKSPOT on my patio. *by on Reviewed in the United Kingdom 7 June 2024* If you have a patio with natural sand stone and it’s covered in blackspot this is incredible in getting it clean and spotless .Just add some to very hot boiling water in a watering can and water your black spot away . ### ⭐⭐⭐⭐⭐ What a brilliant company. *by on Reviewed in the United Kingdom 3 July 2026* Exactly ask expected with the bonus of fantastic customer service. Parcel wasn't delivered by courier & customer services contacted us through Amazon. They immediately sent a replacement out by another courier.Original parcel eventually turned up & countrywise told us to keep both deliveries. There really was no need as they had already replaced, but their kindness & quick responses to resolve the matter will not be forgotten. Will definitely be ordering from this company again. I can not praise them enough. Thank you Countrywise ### ⭐⭐⭐⭐ Great product *by on Reviewed in the United Kingdom 29 August 2025* Works great just takes a lot of water and stirring to dissolve ## Frequently Bought Together - Granular Shock Chlorine Tub of 5 Kg- Blue Horizons - Bluewater Chlorine Granules 5kg - Swimming Pool & Spa - Bluewater pH Plus Increaser 5kg Swimming Pool Chemicals & Spa --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/65172295-granular-shock-chlorine-tub-of-5-kg-blue-horizons](https://www.desertcart.jp/products/65172295-granular-shock-chlorine-tub-of-5-kg-blue-horizons) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-27*