10 Best Pool Shock 73 Calcium Hypochlorite 50 Lb of 2025

Tested and Reviewed: Top 10 Pool Shock 73 Calcium Hypochlorite 50 Lb deals with expert ratings from 8.1 to a perfect 10

May 2025 Edition

Editor's Choice

9.7

ZAPPIT

Zappit 73 Dry Chlorinating Granules for Swimming Pools (50 lb)

Editor's bottom line:

“This pool shock 73 calcium hypochlorite 50 lb is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Pool Shock and Super Chlorinator
Fast dissolving granular formula
73% Cal-Hypo (Calcium Hypochlorite)
Prevents future growth of algae
Non-Stabilized Calcium Hypochlorite

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Picked by 167 people today

9.5

Rx Clear

Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 6 Pack

Main Highlights

MULTI-PURPOSE - This pool shock sanitizes, clarifies, and controls algae giving your swimming pool crystal clear water.
INCREDIBLY STRONG - Due to its high percentage of chlorine, Mega Shock is very effective and efficient for a quick chlorine boost.
MIX BEFORE YOU FIX - Add this powder to a bucket of water before you add it to your pool. Add a 1 lb bag per 10,000 gallons of pool water.
BEAT THE GREEN: - Kill the algae in your swimming pool by adding 2 bags of shock per 14,000 gallons of pool water.
WORKS BEST AT NIGHT - Maximize performance by adding this shock to your pool at night. Wait to swim 8 to 10 hours after application.
NOTE: Cannot be sold or shipped to Maine.

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9.5

My Garden Pool

Drytec Calcium Hypochlorite Pool Shock 68%, 25 LB, Complete Pool Care Kit with My Garden Pool Skimmer Sock Powerful Chlorine Shock for Clear Swimming Water

Main Highlights

Designed for potable water applications, providing effective sanitation
Fast-dissolving granules for consistent solutions
NSF Standard 60 certified for drinking water additives
Meets AWWA standard B300-05
Contains 68% calcium hypochlorite for powerful
Cyanuric acid-free, an effective alternative to gas and liquid hypochlorite
No need for storage tanks or secondary containment
2-year shelf life under ideal conditions
Includes pool skimmer socks to capture debris and enhance filtration

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9.2

Doheny's

Doheny's Super Pool Shock | Pro-Grade Chlorine Shock, Quick-Dissolving, Fast-Acting 68% Cal-Hypo Granular Pool Shock | 24 x 1lb Bags, Proudly Made in The USA

Main Highlights

Fast-Acting Pool Shock: Instantly boosts chlorine levels to eliminate algae and contaminants, keeping your pool crystal clear.
Pro-Grade Cal Hypo Shock: Made with 68% calcium hypochlorite and 65% available chlorine for powerful, long-lasting pool maintenance.
Convenient & Easy to Use: Pre-measured 1lb bags ensure quick, hassle-free applicationno measuring needed.
Effective Dosage: Use 1lb per 10,000 gallons; for spring openings or heavy algae blooms, apply 2-3 doses for best results.
Trusted Quality, Family-Owned: With over 50 years of pool supply expertise, Dohenys provides high-quality products you can count on.

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9.0

Leslie's

Leslie's Power Powder Plus 73-73% Calcium Hypochlorite Pool Shock, Fast-Dissolving Chlorine Granules, Eliminates Bacteria & Algae - Low Residue, Non-Stabilized, 70% Available Chlorine - 12 x 1 Pound

Main Highlights

73% Calcium Hypochlorite with 70% available chlorine kills bacteria, algae, and contaminants.
Quick action with minimal residue, wont significantly raise calcium hardness.
Ideal for super chlorination and routine maintenance, tackles tough algae blooms.
No cyanuric acid, wont raise stabilizer levels, perfect for evening use.
Use 9-18 oz. per 10,000 gallons for 5-10 ppm available chlorine.

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8.8

EZ POOLS

Super Shockwave Pool Shock – 73% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds

Main Highlights

Fast-dissolving formula: Our Super ShockWave Pool Shock quickly dissolves upon application, delivering rapid results for cleaner, clearer water in no time.
Powerful shock treatment: Eliminates organic contaminants, bacteria, and algae, restoring water clarity and freshness for a rejuvenating swim or soak.
Quickly eliminates algae, bacteria, and other harmful contaminants from your pool water.

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8.6

AQUA-ORG PLUS

Pool Shock by Aqua Org Plus - 65% Granular Cal Hypo - Swimming Pool Shock for In-Ground, Above Ground, Spas & Hot Tubs - 50 Pound Pail

Main Highlights

PRODUCT SPECS: 50 pound bucket of Aqua Org Plus calcium hypochlorite (pool shock). Works in in-ground, above-ground pools, spas and hot tubs. 65% Cal Hypo Granules. Great for regular maintenance.
KEY FEATURES: Fast acting Aqua Org Plus calcium hypochlorite & professional-grade formula tackles algae blooms, restores water clarity, raises chlorine levels to eliminate unwanted contaminants. Professional formula trusted by pool maintenance experts. Solves 90% of pool water problems.
DIRECTIONS: Ensure the pool filter is running. Measure (1lb for 10,000 gallons of water) & pour Aqua Org Plus cal hypo into water directly. Distribute evenly. Use a pool brush to ensure granules dissolve into the water and arent sitting on the bottom of the pool. Ensure proper circulation and avoid swimming until chlorine returns to 1-4 ppm.
BENEFITS: Non-stabilized Aqua Org Plus formula (no CYAs) to prevent chlorine lock. Effective for all swimming pool types including pools with liners, gunite pools, and saltwater pool systems. Regular testing of pool water and maintenance are essential for optimal shock treatment results.
BEST PRACTICES: Keep Aqua Org Plus products out of reach of children. Avoid direct contact with skin and eyes. Use in a well ventilated area. Store in a cool dry place, away from sunlight. Follow guidelines and usage instructions provided by the manufacturer. Do not add directly into the pool floater or skimmers.

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8.3

In The Swim

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

Main Highlights

Fast-Acting Algae Control: Calcium Hypochlorite (Cal-Hypo) is an effective non-stabilized chlorine shock treatment, ideal for routine maintenance in your swimming pool
Versatile Use: Suitable for above ground or in-ground swimming pools, spas, and hot tubs; Pre-dissolve or dilute to avoid bleaching the liner
High Chlorine Content: 65% available chlorine, provides powerful sanitization for crystal-clear water
Easy Application: Pre-dissolve or dilute to avoid bleaching swimming pool liners; Spread granules in the deepest part of the pool; Brush if needed
Dosage: Use 1 Pound per 10,000 gallons weekly to maintain 5-10 ppm chlorine levels

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8.1

POOL SHARK

68% Calcium Hypochlorite Pool Shock for Swimming Pools - Chlorine Granules Swimming Pool Shock 50 lbs Bucket - Pool Chlorine for Inground and Above Ground Pool Treatment, Saltwater (50lbs)

Main Highlights

EASY SHOCK TREATMENT FOR FAST RESULTS - After a busy weekend of swimming, your pool needs a quick refresh. Pool Shark fast-dissolving granules make shock pool treatments easy. Just measure it out, toss it in, and watch your water turn from cloudy to crystal-clear in 24 to 48 hours.
CLEANS & CLEARS POOL WATER COMPLETELY - Nothing feels better than stepping into a pool that looks clear and smells fresh. With 68% calcium hypochlorite, our swimming pool chlorine shock granules kill bacteria, fungi, and algae, so you can enjoy safe, clean water with zero cloudiness.
EXACT DOSING NO MATTER YOUR POOL SIZE - Not sure how much chlorine pool shock to use? 1 pound treats 10,000 gallons of water. Safely use these pool chemicals for inground pools that are standard size (10,000-20,000 gal), all the way up to large community pools (100,000-200,000 gal).
COMPATIBLE WITH ALL POOL TYPES - You can use our 68% cal-hypo pool shock for an inground pool and also use our pool shock for above ground pool treatments, spa, hot tubs, vinyl-lined pools, saltwater systems, and all public and residential pools outdoors or inside facilities.
PREMIUM 68% CALCIUM HYPOCHLORITE - Our formula contains 68% active calcium hypochlorite, delivering stronger results than standard chlorine products. When you need fast reliable sanitization, trust Pool Shark to get the job done right the first time.
If you receive items with a different label, Bucket, than what is pictured, please note that any such alteration is purely cosmetic and your Cal Hypo will still function exactly as described

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8.1

Leslie's

Leslie's Power Powder Pro Granular Pool Shock - Fast Dissolving Sanitizer for Crystal Clear Water - Defends Against Bacteria, Algae, and Microorganisms - 73% Calcium Hypochlorite - 50 Pound

Main Highlights

Contains 73% Calcium Hypochlorite and 70% available chlorine, the strongest pool shock available.
Kills bacteria, controls algae, and destroys organic/inorganic contaminants.
Fast-dissolving, low-residue, suitable for treating problems and routine maintenance.
Non-stabilized, no Cyanuric Acid (CyA), ensures clear, sanitized pool water.
Ideal for super chlorination, dosage: 9-18 oz. per 10,000 gallons for 5-10 ppm chlorine.

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Our Best Overall Choice

Best Choice

9.7

ZAPPIT

Zappit 73 Dry Chlorinating Granules for Swimming Pools (50 lb)

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Pool Shock and Super Chlorinator
Fast dissolving granular formula
73% Cal-Hypo (Calcium Hypochlorite)
Prevents future growth of algae
Non-Stabilized Calcium Hypochlorite

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10 Best Pool Shock 73 Calcium Hypochlorite 50 Lb of 2025

Tested and Reviewed: Top 10 Pool Shock 73 Calcium Hypochlorite 50 Lb deals with expert ratings from 8.1 to a perfect 10

ZAPPIT

Zappit 73 Dry Chlorinating Granules for Swimming Pools (50 lb)

Editor's bottom line:

Main Highlights

Rx Clear

Rx Clear Mega Shock | 73% Calcium Hypochlorite | Kills Algae in Swimming Pools | Works As Pool Sanitizer Clarifier and Algicide | One Pound Bags | 6 Pack

Main Highlights

My Garden Pool

Drytec Calcium Hypochlorite Pool Shock 68%, 25 LB, Complete Pool Care Kit with My Garden Pool Skimmer Sock Powerful Chlorine Shock for Clear Swimming Water

Main Highlights

Doheny's

Doheny's Super Pool Shock | Pro-Grade Chlorine Shock, Quick-Dissolving, Fast-Acting 68% Cal-Hypo Granular Pool Shock | 24 x 1lb Bags, Proudly Made in The USA

Main Highlights

Leslie's

Leslie's Power Powder Plus 73-73% Calcium Hypochlorite Pool Shock, Fast-Dissolving Chlorine Granules, Eliminates Bacteria & Algae - Low Residue, Non-Stabilized, 70% Available Chlorine - 12 x 1 Pound

Main Highlights

EZ POOLS

Super Shockwave Pool Shock – 73% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds

Main Highlights

AQUA-ORG PLUS

Pool Shock by Aqua Org Plus - 65% Granular Cal Hypo - Swimming Pool Shock for In-Ground, Above Ground, Spas & Hot Tubs - 50 Pound Pail

Main Highlights

In The Swim

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

Main Highlights

POOL SHARK

68% Calcium Hypochlorite Pool Shock for Swimming Pools - Chlorine Granules Swimming Pool Shock 50 lbs Bucket - Pool Chlorine for Inground and Above Ground Pool Treatment, Saltwater (50lbs)

Main Highlights

Leslie's

Leslie's Power Powder Pro Granular Pool Shock - Fast Dissolving Sanitizer for Crystal Clear Water - Defends Against Bacteria, Algae, and Microorganisms - 73% Calcium Hypochlorite - 50 Pound

Main Highlights

Our Best Overall Choice

ZAPPIT

Zappit 73 Dry Chlorinating Granules for Swimming Pools (50 lb)

Editor's bottom line:

Main Highlights

Related Deals You Might Like for Pool Shock 73 Calcium Hypochlorite 50 Lb

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Drytec Calcium Hypochlorite Pool Shock 68%, 25 LB, Complete Pool Care Kit with My Garden Pool Skimmer Sock Powerful Chlorine Shock for Clear Swimming Water

Drytec Calcium Hypochlorite Pool Shock 1 lb. 68% Bag, Complete Pool Care Kit with My Garden Pool Skimmer Sock and 7-in-1 Test Strips, 60 ct. – Powerful Chlorine Shock for Clear Swimming Water (12)

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