GLB Super Charge Cal Hypo Granular Chlorine Shock 25 lb Pail | 71430
GLB

GLB Super Charge Cal Hypo Granular Chlorine Shock 25 lb Pail | 71430

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About This Item

GLB Super Charge Cal Hypo - 25Lb Pail

  • Zaps organic pollutants, bacteria and algae!
  • Provides a fast-acting chlorine boost at an affordable price
  • Perfect for spring start-up!
  • 1 lb. treats 10,000 gallons
  • To avoid bleaching vinyl liners, be sure to pre-mix prior to treatment

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More about Pool Shock Treatments for Water Clarity

Buyer's Guide: Pool Shock Treatments for Water Clarity

Option 1: [Calcium Hypochlorite (Cal-Hypo)]

Best For: Killing Algae & Weekly Maintenance (Concrete/Gunite Pools).

Key Feature: The strongest commercial shock available (typically 65%–73%). It is unstabilized, meaning it works aggressively and won't raise your CYA levels.

Expectation: It dissolves slowly and boosts Calcium Hardness over time. Pre-dissolving is highly recommended to prevent bleaching.

Option 2: [Dichlor / Vinyl Safe Shock]

Best For: Vinyl Liner Pools.

Key Feature: Dissolves almost instantly and has a neutral pH. It is much gentler on pool surfaces than Cal-Hypo.

Expectation: Contains Cyanuric Acid (Stabilizer). If used too frequently, it can raise your stabilizer levels too high, leading to "Chlorine Lock."

Option 3: [Non-Chlorine Shock (MPS)]

Best For: Quick "Refresh" & Sensitive Swimmers.

Key Feature: Oxidizes contaminants (sweat/oils) to clear up cloudy water without adding chlorine.

Expectation: Swim in 15 mins. Does not kill algae. Use this midweek to clarify water, but use a Chlorine shock if you have algae.

Complete Your Pool Care Routine

Essential Pairing
Pool and Spa Algaecides for Algae Control

Shock kills the active bloom, but Algaecide acts as the "shield" to prevent it from growing back the next day.

Shop Pool and Spa Algaecides for Algae Control
Highly Recommended
Pool Test Kits and Water Analysis Tools

You must test your pH before shocking (shock works poorly in high pH) and test Chlorine afterwards to know when it's safe to swim.

Shop Pool Test Kits and Water Analysis Tools
Pro Tip: Don't Forget
Pool Brushes for Thorough Surface Cleaning

Algae has a protective slime layer; you must brush the pool walls vigorously before shocking to expose the algae to the chemicals.

Shop Pool Brushes for Thorough Surface Cleaning
Technician's Guide: Pool Shock Treatments for Water Clarity +

Pool Shock is a concentrated blast of sanitizer designed to solve problems your daily chlorine tablets can't handle. While tablets maintain a steady baseline, they dissolve too slowly to fix big issues. Shock is your heavy artillery.

It works by "Super-Chlorinating" the water—raising sanitizer levels high enough to burn off dead organic matter (sweat, sunscreen, leaves) and kill stubborn algae blooms. It also eliminates "Chloramines"—the "dead" chlorine molecules that cause that strong chemical smell and irritate your eyes.

The 3 Main Uses:

  • Weekly Maintenance: To oxidize waste and keep water crystal clear.
  • Algae Removal: To kill green, yellow, or black algae blooms.
  • Event Recovery: To sanitize the water after a heavy rainstorm or a crowded pool party.

For best results, we recommend shocking your pool once a week during the swimming season, typically on Sunday evenings.

Common Questions +

Why must I shock at night?
Sunlight is shock's enemy. UV rays can burn off unstabilized chlorine in just a few hours, wasting your money before it cleans the water. Shocking at dusk or night gives the chemicals 8–10 hours of darkness to work at full strength.

Can I dump the bag directly into the pool?
We strongly recommend pre-dissolving granular shock in a bucket of water first. If granules settle on your pool floor (especially in Vinyl Liner pools), they can bleach the color out of the liner or damage the surface. Always add chemicals to water, never water to chemicals.

How long do I wait to swim?

  • Chlorine Shock (Cal-Hypo): Wait until chlorine levels drop to a safe range (1–4 ppm). This usually takes 12–24 hours.
  • Non-Chlorine Shock (MPS): You can usually swim in 15 minutes.

Will shock fix a green pool?
Yes, but you need the right kind. You need a chlorine-based shock (like Cal-Hypo) to kill the algae. Non-chlorine shock will not kill algae; it only oxidizes organic waste. If your pool is a swamp, you may need to "Triple Shock" (use 3x the normal dose).

Why is the water cloudy after I shock?
This is actually a good sign! It means the shock has successfully oxidized contaminants or killed algae, leaving behind suspended grey/white particles. Keep your filter running 24/7 to catch this debris. If it doesn't clear in 48 hours, use a [Clarifier].

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