Natural Chemistry Cal Hypo Pool Shock – Pro Series 25LB

Professional-Grade Pool Shock for Clear, Safe Water

To keep a swimming pool safe and clean, you need a good sanitizer. The Natural Chemistry Cal Hypo Pool Shock – Pro Series 25LB is designed for professional use. It has 65% available calcium hypochlorite (cal hypo) and fast-dissolving granules. This product fights algae, bacteria, and organic contaminants effectively.

You might need regular maintenance for your home or manage large pools. This 25LB professional pail provides the strength, consistency, and value you need. It offers year-round protection.

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Why Choose Natural Chemistry Pro Series Cal Hypo?

There are many types of pool shock. Calcium hypochlorite is special because it has a high chlorine concentration and works quickly. This formula from Natural Chemistry is strong enough for commercial use. It is also easy for homeowners to apply.

Key advantages include:

• 65% chlorine concentration for rapid oxidation and sanitization

• Fast-dissolving granules that minimize residue and cloudy water

• Versatile applications: algae treatment, weekly shock, or contamination recovery

• Bulk 25LB pail ideal for ongoing maintenance and cost efficiency

• Trusted Pro Series quality from Natural Chemistry, a leader in pool chemistry solutions

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How Calcium Hypochlorite Pool Shock Works

Calcium hypochlorite is one of the most reliable sanitizers used in the pool industry. Once added to water, it releases free available chlorine (FAC), which quickly breaks down:

• Harmful bacteria

• Organic contaminants

• Algae spores

• Viruses and microorganisms

The result is crystal-clear water that is safe and inviting for swimmers. Cal hypo works right away and does not raise cyanuric acid (CYA) levels. This makes it a great choice for pools that already have stabilizer.

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Application Guidelines

To achieve the best results, always test and balance your pool water before applying any shock treatment.

Water balance targets before shocking:

• pH: 7.2 – 7.6

• Total alkalinity: 80 – 120 ppm

• Calcium hardness: 200 – 400 ppm

Dosage recommendations:

• Routine maintenance: 1 lb per 10,000 gallons weekly

• Heavy use or algae outbreaks: 2 – 3 lbs per 10,000 gallons as needed

• Opening or closing a pool: Apply 2 lbs per 10,000 gallons to oxidize contaminants

Steps for use:

1. Test and adjust pH and alkalinity.

2. Broadcast the recommended dose evenly across the deep end at night.

3. Keep the pump running for 6–8 hours for proper circulation.

4. Wait until chlorine levels return to 1–4 ppm before swimming.

⚠️ Important Safety Note: Never add cal hypo through the skimmer or mix it with other chlorine types (such as trichlor or dichlor). Mixing can cause dangerous chemical reactions.

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Benefits of Using Natural Chemistry Cal Hypo Shock

• Fast algae control – Stops growth and clears green or cloudy pools.

• Powerful sanitizer – Eliminates bacteria and pathogens on contact.

• Reliable clarity – Oxidizes organic matter for sparkling water.

• Cost-effective bulk size – One 25LB pail lasts through multiple treatments.

• Flexible usage – Ideal for routine care or heavy-demand situations.

• Commercial or residential use – Meets the needs of pool professionals and homeowners alike.

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Comparing Pool Shock Options

Not all chlorine shocks are the same. Understanding the differences helps pool owners choose the right product for their needs.

• Calcium Hypochlorite (Cal Hypo):

  • 65% chlorine content (this product)

  • Fast-acting, unstabilized sanitizer

  • Increases calcium hardness slightly

  • Best for immediate results and algae clean-ups

• Dichlor Shock:

  • Contains stabilizer (CYA)

  • Lower chlorine concentration (~56%)

  • Gentle on vinyl liners

  • More expensive per pound

• Non-Chlorine Shock (Potassium Monopersulfate):

  • Oxidizes organic material without chlorine

  • Does not sanitize

  • Useful for indoor pools or chlorine-sensitive swimmers

Natural Chemistry Cal Hypo Shock gives the best balance of strength, affordability, and speed for most outdoor pool applications.

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Best Practices for Safe Handling

• Always wear protective gloves and goggles when handling cal hypo.

• Store the 25LB pail in a cool, dry, well-ventilated area.

• Do not mix with other pool chemicals, especially trichlor tablets or acids.

• Keep the container tightly closed when not in use.

• Keep out of reach of children and pets.

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Frequently Asked Questions (FAQ)

Q: How often should I use calcium hypochlorite shock?
A: For routine maintenance, shock your pool once a week. For algae or contamination events, increase to 2–3 lbs per 10,000 gallons until the issue clears.

Q: Can I use this shock with chlorine tablets?
A: Yes, but do not add them at the same time or in the same feeder. Tablets contain stabilizer (CYA) while cal hypo is unstabilized. Keep them separate to avoid reactions.

Q: Does calcium hypochlorite increase calcium hardness?
A: Yes, slightly. Regular use may raise calcium hardness over time. Test regularly and manage with proper balancing to avoid scaling.

Q: Is cal hypo safe for vinyl pools?
A: Yes, but always pre-dissolve in a bucket or broadcast into the deep end while the pump is running to avoid bleaching liners.

Q: How long after shocking can I swim?
A: Wait until free chlorine levels return to 1–4 ppm. Typically this takes 8–24 hours depending on dosage and circulation.

Q: What’s the shelf life of this product?
A: Stored properly in a sealed container away from moisture, calcium hypochlorite can remain effective for 2–3 years.

Q: Why choose Natural Chemistry Pro Series instead of generic brands?
A: Natural Chemistry is a trusted leader in water care. Their Pro Series products are made to high quality standards. This ensures they have consistent chlorine strength and are safe to handle, unlike off-brand options.

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Key Features (Bullet List)

• 25LB professional pail of calcium hypochlorite pool shock

• 65% available chlorine concentration for powerful sanitation

• Fast-dissolving granules reduce residue and clear water quickly

• Effective against algae, bacteria, and organic contaminants

• Ideal for weekly pool shock treatments and emergency recovery

• Commercial-grade quality trusted by professionals

• Compatible with most pool types when applied correctly

• Backed by Natural Chemistry’s Pro Series reputation