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In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
Quickly eliminates algae, bacteria, and other harmful contaminants from your pool water with 68% Calcium Hypochlorite (Cal-Hypo) active ingredient.
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds 25237
Item #: 30928857

In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25

Item #: 30928857

€ 124

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Quickly eliminates algae, bacteria, and other harmful contaminants from your pool water with 68% Calcium Hypochlorite (Cal-Hypo) active ingredient.
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What Stands Out

High Purity
Contains 68% calcium hypochlorite, ensuring powerful sanitation for your pool while effectively killing bacteria and algae, providing crystal clear water that enhances your swimming experience.
Bulk Packaging
Offered in a generous 25-pound size, this product delivers exceptional value and longevity, making it ideal for frequent pool maintenance without the hassle of constant repurchasing.
Immediate Results
Quick-dissolving granules provide rapid chlorine action, allowing you to instantly treat your pool water, ensuring a safe and enjoyable swimming environment for friends and family.

Product Details

Get the best deals on 25 lbs Calcium Hypochlorite Pool Shock Bucket from In The Swim at Ubuy Ireland. Enjoy clean and clear pool water with this powerful pool chemical.
  • h5 { color: #000; font-weight: 600; } When algae starts getting out of hand, turn to the fast-acting Calcium Hypochlorite chlorine granules pool shock! The 68% Calcium Hypochlorite active ingredient is very effective at killing and deactivating harmful contaminants such as bacteria, algae and other microorganisms. With 65% minimum available chlorine, Cal-Hypo (Calcium Hypochlorite) will provide you with the sanitizing power you need to keep your swimming pool or spa water crystal clear and safe for your swimmers. The non-stabilized formula is great for super shocking your water or everyday routine dosages, without the need to contain cyanuric acid. 68% Active Ingredient Calcium Hypochlorite pool shock 50lb bucket has 68% calcium hypochlorite active ingredient to provide strong, concentrated sanitization for your pool water. With 65% minimum available chlorine, In The Swim Calcium Hypochlorite will help maintain healthy and sanitary swimming pool water. Great for Commercial and Residential Use Whether your swimming pool is at a hotel, apartment complex or home, Calcium Hypochlorite granules are a great pool shock to keep your water sanitized and clean. Don't settle for anything less when looking for a pool shock to effectively treat pool problems like algae blooms and swimming accidents fast. As the chlorine dissolves in the water, it forms hypochlorous acid which is what kills and eradicates algae and bacteria. By destroying bacteria, algae, germs and pathogens, Calcium Hypochlorite pool granules provide a safer swimming environment while also improving and maintaining water clarity. Cal-Hypo pool shock 25lb bucket will provide your pool and spa the sanitizing power you need to keep your water crystal clear for its occupants. Usage Directions for Swimming Pools: Add the recommended dosage of In The Swim Calcium Hypochlorite Pool Shock during the evening hours while the filter pump is running. When adding this product to your pool, broadcast the product evenly over a wide area in the deepest part of the pool. If any granules settle to the bottom of the pool use a brush to disperse. Water Balance: For best product performance, swimmer comfort, and crystal clear water: Maintain pH in the range of 7. 2 to 7. 6. Maintain total alkalinity in the range of 60 to 120 parts per million (ppm). Maintain calcium hardness above 200 ppm. Use a reliable test kit that measures all these ranges. Use In The Swim Pool Care Products to make adjustments. Follow label directions for each product. Do not enter the pool until the free available chlorine residual is 1-4 ppm for each of the below noted water treatment applications. Shock Treatment / Superchlorination: For best results, see Water Balance and Usage Directions sections above before treatment. Every 7 days, or as necessary to prevent pool problems, shock / treat / superchlorinate the pool by adding 1 lb. of this product per 10,000 gallons of water to provide 5 to 10 ppm available chlorine. Additional shock treatments may be required to correct problems which are caused by visible algae, high bathing loads, heavy wind and rainstorms. Additional shock treatments may also be required to correct problems such as unpleasant odors and eye irritation. Check the available chlorine with a suitable test kit Algae Control: Follow Shock Treatment directions on the label. Add this product as close as possible to any algae on the side or bottom the pool. If necessary, repeat treatment. To prevent possible staining or bleaching, take the following steps immediately after treatment: Thoroughly clean pool by brushing surface of algae growth, vacuum and cycle through filter. Commonly Asked Questions: What are the Calcium Hypochlorite chlorine granules comparable to? - In The Swim Calcium Hypochlorite 68% is comparable to HTH, SPP, and Pulsar. What is the chemical make up of the Calcium Hypochlorite chlorine granules? - In The Swim Calcium Hypochlorite are 65% minimum
Chemical standard typeShock
Pool chemical typeChlorine Pool Chemicals
Weight25 lbs (11.34 kg)
Count1
Rec. useSwimming Pool
Piece count1
Size25 lbs
BrandIn The Swim

Who Should Buy?

Suitable For
  • Pool Owners

    Ideal for pool owners seeking effective sanitation against algae and bacteria in residential swimming pools.

  • Frequent Swimmers

    Great for families and individuals who swim often and require consistent water clarity and sanitation.

  • Emergency Treatment

    Perfect for situations requiring immediate shock treatment to restore water quality after heavy usage or contamination.

Not Suitable For
  • Small Pools

    Not suitable for very small or inflatable pools where smaller doses and treatments are more appropriate.

  • Sensitive Users

    Individuals with skin allergies or sensitivities may react negatively to high chlorine levels in pool shock.

  • Non-Chlorine Pools

    Not recommended for pools that utilize alternative sanitizing systems, as it can disrupt their chemical balance.

Product Description

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Product Buying Guide

Keep your swimming pool or spa water sanitized and clean with the fast-acting In The Swim 25 lbs Calcium Hypochlorite Pool Shock Bucket. Its 68% Calcium Hypochlorite active ingredient effectively kills and deactivates harmful contaminants like bacteria and algae, providing crystal clear and safe water for swimmers. Whether for commercial or residential use, this pool shock is suitable for tackling pool problems like algae blooms and accidents. Before making your purchase, consider the following guide to understand the features, usage scenarios, user reviews, price analysis, and buying considerations.

Product Specifications

  • 68% Active Ingredient Calcium Hypochlorite pool shock
  • 25lb bucket
  • 65% minimum available chlorine
  • 35% calcium content
  • Suitable for swimming pools, spas, and hot tubs
  • Must pre-dissolve/dilute to prevent bleaching of the liner
  • California Proposition 65WARNING: This product can expose you to some chemicals

Key Features

  • Powerful chlorine shock treatment for regular maintenance
  • Quickly eliminates algae, bacteria, and other harmful contaminants
  • Effective for commercial and residential use
  • Provides crystal clear and safe water for swimmers
  • 68% Calcium Hypochlorite active ingredient
  • Non-stabilized formula suitable for super shocking or everyday routine dosages
  • Suitable for swimming pools, spas, and hot tubs

Usage Scenarios

  • Regular maintenance of swimming pools, spas, and hot tubs
  • Quickly eliminating algae, bacteria, and contaminants from pool water
  • Suitable for commercial and residential use
  • For super shocking the water or everyday routine dosages

Usage Scenarios

  • HTH
  • SPP
  • Pulsar

Some User Review

  • Users appreciate the fast-acting nature of the Calcium Hypochlorite pool shock, effectively eliminating contaminants and maintaining crystal clear water. Many have found it to be suitable for both commercial and residential use, providing the necessary sanitizing power for safe swimming.
  • The 68% Calcium Hypochlorite active ingredient has been highly praised for its effectiveness in quickly eradicating harmful microorganisms from pool water, ensuring a safer swimming environment for users.
  • Feedback on the product's ability to provide crystal clear water, suitable for both routine maintenance and super shocking, has been overwhelmingly positive. Users have found it to be a reliable solution for keeping swimming pools, spas, and hot tubs clean and sanitized

Competitors

  • The product is competitively priced compared to its counterparts HTH, SPP, and Pulsar, offering great value for its strong, concentrated sanitization capabilities.
  • It proves to be a cost-effective option considering its 68% Calcium Hypochlorite active ingredient, quick sanitizing capability, and suitability for various pool types.

Buying Considerations

  • Consider the required dosage for your pool's size to ensure effective sanitization without overusing the product.
  • Be mindful of the pre-dissolving/dilution requirement to prevent bleaching of the liner when using in swimming pools, spas, and hot tubs.
  • Prioritize the maintenance of ideal water balance parameters (pH, total alkalinity, and calcium hardness) for best product performance and swimmer comfort
  • Take into account the 65% minimum available chlorine content and 35% calcium content of the product, ensuring it aligns with your pool maintenance needs.

Conclusion

In summary, the In The Swim 25 lbs Calcium Hypochlorite Pool Shock Bucket is an excellent choice for pool owners seeking a fast-acting, powerful, and cost-effective solution to maintain crystal clear, sanitized water. With its 68% Calcium Hypochlorite active ingredient and suitability for various pool types, it provides great value for both commercial and residential use.

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Keep your swimming pool or spa water sanitized and clean with the fast-acting In The Swim 25 lbs Calcium Hypochlorite Pool Shock Bucket. Its 68% Calcium Hypochlorite active ingredient effectively kills and deactivates harmful contaminants like bacteria and algae, providing crystal clear and safe water for swimmers. Whether for commercial or residential use, this pool shock is suitable for tackling pool problems like algae blooms and accidents. Before making your purchase, consider the following guide to understand the features, usage scenarios, user reviews, price analysis, and buying considerations. Continue Reading

Customer Questions & Answers

  • Question: How do I use the product for swimming pools?

    Answer: Add the recommended dosage during the evening hours while the filter pump is running and disperse evenly over a wide area in the deepest part of the pool.
  • Question: What water balance should I maintain for best results?

    Answer: Maintain pH between 7.2 to 7.6, total alkalinity between 60 to 120 ppm, and calcium hardness above 200 ppm.
  • Question: Is this product suitable for spas and hot tubs?

    Answer: Yes, it can be used in swimming pools, spas, and hot tubs after being dissolved to prevent bleaching.

In The Swim Chlorine Tablets Editorial Review

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“The product received very good packaging & safe…Thank You”

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12 June 2026 · via Trustpilot
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  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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