HTH Pool Care Chlorine Shock Granules 6 Pack 4.99 lbs Cal Hypo Pool Shock Treatment for Weekly Use
HTH Pool Care Chlorine Shock — Granules, 6 Pack (13.3 oz each) — Pool Shock Treatment for Weekly Use
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HTH Pool Care Chlorine Shock — Granules, 6 Pack (13.3 oz each) — Pool Shock Treatment for Weekly Use

1,370 ratings

Key item features

  • Multi-functional Treatment: Shock treats, sanitizes, clarifies, and helps prevent bacteria and algae in swimming pool water with a convenient, easy-to-use product.
  • Fast-Acting Formula: This multi-use pool shock with Cal Hypo solves 90% of pool water problems within 24 hours, acting and dissolving quickly.
  • Brilliant Water Clarity: The Cal Hypo based formula sanitizes without adding cyanuric acid (CYA), preventing over-stabilization or chlorine lock for a visibly brilliant sparkle.
  • Universal Pool Compatibility: Great for all pool types, including vinyl-lined pools and saltwater systems, without fading the pool liner.
  • Boosts Chlorine: Designed to boost chlorine levels and kill bacteria and algae for a clean, clear pool.
  • Weekly Maintenance: Apply as part of a weekly pool care routine to maintain free available chlorine levels between 1 and 4 ppm.
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Specs

Chemical standard type, Calcium Hypochlorite ShockForm, GranulesPool chemical type, Swimming Pool ShockProduct net content parent, 4.98 PoundWeight, 4.99 lbBrand, HTH

About this item

Product details

HTH Pool Care Shock, Boosts Chlorine Levels, Cal Hypo Formula, 13.3 oz (Pack of 6)

HTH® Shock is the original swimming pool shock designed to boost chlorine levels and kill bacteria and algae for a clean, clear pool. Traditional chlorine products contain cyanuric acid (CYA). When too much CYA builds up, it can cause over-stabilization or chlorine lock and cloud your water. The fast-acting, fast-dissolving Cal Hypo based formula in HTH® Shock provides chlorination without adding extra CYA for a beautiful sparkle all season. This pool chemical shock is great for all pool types and won't fade your pool liner.

How To Use HTH® Shock Follow the on-pack instructions according to your pool size to add HTH® Shock directly to swimming pool water or skimmer. For best results, apply HTH® Shock as part of your weekly pool care routine to keep free available chlorine levels between 1 and 4 ppm.

  • Shock treat, sanitize, clarify and help prevent bacteria and algae in your swimming pool water, all with this convenient, easy-to-use product.
  • Multi-use pool shock with Cal Hypo - Use weekly to solve 90% of pool water problems within 24 hours - Fast-acting and fast-dissolving.
  • Visibly brilliant sparkle This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent over-stabilization or chlorine lock.
  • Compatible with all swimming pools This product is great for all pool types including vinyl-lined pools and saltwater systems.
  • You’re all clear with HTH™ For best results, use with HTH™ 6-Way Test Strips to test and balance your swimming pool water twice weekly.
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Specifications

Chemical standard type

Calcium Hypochlorite Shock

Form

Granules

Pool chemical type

Swimming Pool Shock

Product net content parent

4.98 Pound

Warranty

Warranty information

N/A

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Customer ratings & reviews

4.6 out of 5 stars
stars
1,370 ratings374 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars81% (1,113)
  2. 4 stars10% (137)
  3. 3 stars4% (49)
  4. 2 stars2% (23)
  5. 1 star4% (48)

Reviews summary

Pros

  • : Premeasured packets dissolve fast for simple pool treatment.
  • : It operates reliably and lasts a long time.
  • : The formula restores and maintains pool visibility after treatment and rain.
  • : The product offers low, competitive pricing.

Neutral

  • : Water clears by morning, but two packets may produce no change.
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Showing 1-3 of 374 reviews

Oct 4, 2026
Reviewer name: Robert
Top Reviewer
Walmart Associate
Item details
Size: 13.3 oz
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

helps with algae

works great. helps to keep algae down. and pool running smoothly. easy to use.

Helpful?2f781e50-bb13-11f1-a662-695ec49556ce477858874
Aug 11, 2026
Reviewer name: John
Top Reviewer
Item details
Size: 13.3 oz
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Pool Shock

Item works well, dissolves fast, makes pool cloudy at time of use but clears quickly. used it and it took care of slight algae problem we had. Has slight chlorine smell when first used but doesn't last long. Follow instruction on package.

Helpful?2f781e50-bb13-11f1-a662-695ec49556ce477858874
Aug 3, 2026
Reviewer name: Patricia
Top Reviewer
Item details
Size: 13.3 oz
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Good quality and great price ! Dissolves easily during application.

Helpful?2f781e50-bb13-11f1-a662-695ec49556ce477858874
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