GLB Calcium Hypochlorite Pool Shock — 1-Pound Packets, 12-Pack, 73% Formula, Cyanuric-Acid-Free

GLB SuperSonic Calcium Hypochlorite Pool Shock is a fast-acting, cyanuric-acid-free pool sanitizer and shock treatment sold in convenient 1-pound packets (12-pack) for routine clarifying, algae control, and oxidation.

Use this 73% calcium hypochlorite formula to quickly raise available chlorine, clear cloudy water, and help control algae without adding stabilizer. The product dissolves cleanly on all typical pool surfaces, leaves no visible residue when used as directed, and is designed to avoid over-stabilizing the sanitizer level because it contains no cyanuric acid. Packaged as single-pound units, the 12-pack offers easy handling and measured dosing for residential pools.

How much shock should I add to my pool and how often?

Add 9 to 18 ounces of GLB SuperSonic per 10,000 gallons of water to provide approximately 5 to 10 ppm of available chlorine — the recommended range for routine shock treatments. Frequency depends on pool use, weather, and contamination: weekly shock for regular use, after heavy bather load, or following storms.

• Dosage: 9–18 oz per 10,000 gallons for 5–10 ppm available chlorine.
• Typical schedule: weekly maintenance or as-needed after heavy use.
• For algae or severe contamination, follow graded treatments and retest chlorine.

Will this product affect my pool’s stabilizer or leave residue?

GLB SuperSonic does not contain cyanuric acid (stabilizer), so it won’t raise CYA levels in your pool. When dissolved and applied according to instructions, it is formulated to leave no visible residue on standard pool finishes.

• No cyanuric acid — safe for pools where you want to control stabilizer levels.
• Leaves no visible residue when dosed and mixed properly.
• Compatible with common pool surfaces when used as directed.

How does this shock fit into routine water chemistry maintenance?

Use SuperSonic as part of a maintenance routine that includes monitoring pH and alkalinity. For best results, keep pH between 7.2 and 7.6 and total alkalinity between 60 and 120 ppm to optimize sanitizer performance and swimmer comfort.

• Recommended pH: 7.2–7.6 for effective chlorine action.
• Maintain total alkalinity: 60–120 ppm to stabilize pH fluctuations.
• Test water before and after shocking to confirm target chlorine and chemical balance.

Is this product safe to use on all pool types and surfaces?

GLB’s calcium hypochlorite formula is intended for standard concrete, plaster, vinyl, and fiberglass pools when used as directed. Take precautions with calcium-sensitive equipment and avoid adding undissolved granules directly to the pool to prevent localized bleaching or deposits.

• Suitable for concrete, plaster, vinyl, and fiberglass pools.
• Dissolve properly and distribute evenly to prevent localized effects.
• Monitor calcium hardness if using shock frequently; consult product instructions for compatibility notes.

Who is this for: GLB SuperSonic 1-pound packets in a 12-pack are ideal for homeowners and pool service professionals seeking a reliable, high-strength shock that is easy to store and dose. It suits pools needing fast chlorine boosts without adding stabilizer, and it works well for regular maintenance, emergency clarifying treatments, and post-event sanitation.