Protect your pool from algae and bacteria with reliable Cal-Hypo shocks. This guide highlights five popular 1-pound and equivalent shock products, including quick-dissolving formulas and multi-pack options. Each product is evaluated on chlorine strength, dissolving speed, and suitability for different pool setups. Use the buying guide to compare applications, maintenance routines, and safety considerations to keep your water sparkling all season long.
| Product | Brand | Type | Size |
|---|---|---|---|
| HTH 52035 Swimming Pool Care Shock Advanced | HTH | Cal Hypo Shock, 4-in-1 | 1 lb |
| In The Swim Pool Shock – Cal-Hypo 68% | In The Swim | Granular Sanitizer | 12 x 1 lb |
| HTH 52037R Pool Care Shock Advanced | HTH | Cal Hypo Shock, 1 lb pack | 12 pk |
| In The Swim Pool Shock – Cal-Hypo 68% | In The Swim | Granular Sanitizer | 24 x 1 lb |
| Doheny’s Super Pool Shock | Doheny’s | Cal Hypo Shock | 24 x 1 lb |
Note: All products are Cal-Hypo based shocks designed to raise chlorine levels quickly and sanitize effectively. When selecting a product, consider pool size, whether your pool is above-ground or in-ground, and whether you prefer individual bags or bulk multi-packs for maintenance efficiency.
HTH 52035 1 lb Pool Shock Advanced
HTH’s 52035 is a fast-dissolving, four-in-one shock that fights bacteria and algae while reducing chlorine odor and irritation. It restores crystal clarity within about 24 hours and sanitizes without adding cyanuric acid (CYA), helping to prevent chlorine lock. This single-pound format is convenient for weekly maintenance and quick fixes after heavy pool use.
In The Swim Pool Shock – 68% Cal-Hypo (12 x 1 lb)
This product delivers 68% available chlorine in a non-stabilized Cal-Hypo formula, making it suitable for routine pool maintenance. It’s versatile for above-ground or in-ground pools, spas, and hot tubs. Pre-dissolve or dilute to avoid liner bleaching, and apply as part of a regular shock regimen to maintain crystal-clear water and strong sanitization.
HTH 52036R Pool Care Shock Advanced (6 Pack)
HTH’s 52036R offers a Cal Hypo formulation with rapid action and a multi-functional design. It’s designed to solve the majority of pool water problems within 24 hours, delivering a visibly brilliant sparkle without cyanuric acid. The six-pack format supports regular maintenance for larger pools or households with frequent pool usage.
HTH 52037R Pool Care Shock Advanced (12 Pack)
This 12-pack provides convenient, pre-measured Cal-Hypo shock units designed for weekly maintenance. The formula kills bacteria and algae while minimizing odors and irritation, and it helps restore water clarity quickly. The Cal Hypo base avoids adding extra CYA, reducing long-term stabilization concerns.
In The Swim Pool Shock – 68% Cal-Hypo (24 x 1 lb)
This bulk option delivers a high concentration of available chlorine for larger maintenance needs. The product is suitable for both in-ground and above-ground pools and works well for routine shocking to maintain clear water. Pre-dissolve or dilute to protect pool liners, then disperse evenly across the pool surface for uniform coverage.
Doheny’s Super Pool Shock (24 x 1 lb)
Doheny’s pro-grade Cal Hypo shock uses 68% available chlorine to quickly raise chlorine levels and combat algae and contaminants. The 1-pound bags are pre-measured for convenient application, making it easy to perform weekly shocks or after heavy pool activity without measuring.
Buying Guide: Key Purchase Considerations
When choosing a pool shock, consider chlorine strength, stability, and compatibility with your pool type. Cal-Hypo shocks offer high available chlorine and fast action but can be unstabilized, which means they don’t add stabilizers like cyanuric acid and may require more frequent shocking in sunny climates. For vinyl liners, pre-dissolving or diluting is important to prevent liner bleaching. For larger pools, bulk packs can reduce the number of shipments and simplify maintenance routines.
- Pool type and size: Match the product’s dosing to your pool volume to avoid under- or over-shocking.
- Stabilization: Cal-Hypo shocks are effective and fast-acting but do not contribute to CYA; consider stabilizers separately if needed.
- Form and application: Pre-measured bags are convenient, while bulk bags offer cost savings for frequent shock treatments.
- Safety: Wear protective gear during handling, keep kids and pets away from treated water until safe, and follow label directions precisely.
- Maintenance schedule: Regular weekly shocking supports clear water, with adjustments after heavy use, rainfall, or high temperatures.