HTH Pool Care Chlorine Shock Granules for Algae Prevention, Fast-Acting, 12 pack
HTH Pool Care Chlorine Shock Granules for Algae Prevention, Fast-Acting, 12 pack
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HTH Pool Care Chlorine Shock Granules for Algae Prevention, Fast-Acting, 12 pack

673 ratings

Key item features

  • Weekly Boost: Provides an intense weekly chlorine boost, quickly increasing chlorine levels to address 90% of pool water problems within 24 hours.
  • Algae Prevention: Effectively prevents bacteria and algae growth, contributing to a clean and clear swimming pool.
  • Fast Dissolving: Features a fast-acting and fast-dissolving granular formula for efficient application and rapid results.
  • Cal Hypo: Utilizes a Cal Hypo based formula that delivers chlorination without adding extra cyanuric acid (CYA), preventing over-stabilization or chlorine lock.
  • Universal Compatibility: Suitable for all pool types and will not cause fading of pool liners.
  • Simple Application: Can be added directly to swimming pool water or skimmer, with instructions provided for proper dosage based on pool size.
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Customer ratings & reviews

4.5 out of 5 stars
stars
673 ratings218 reviews
How item rating is calculated
  1. 5 stars79% (534)
  2. 4 stars8% (57)
  3. 3 stars5% (32)
  4. 2 stars1% (7)
  5. 1 star6% (43)

Reviews summary

Pros

  • : Instructions are easy to understand and apply without measuring.
  • : Directions are simple and straightforward.
  • : Quickly sanitizes and keeps water crystal clear.
  • : Dissolves in a few hours or less.
  • : Offers budget-friendly pool shock treatment solutions.

Neutral

  • : Can be gentle, but may contain harsh ingredients.
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Showing 1-3 of 218 reviews

Jul 1, 2026
Reviewer name: OrangeAlleyCat
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great Buy on sale

Very good shock that dissolves completely in deep end of pool. Each bag treats 12,500 gallons of water which is more than most 1 lb. bags. I like HTH shock but usually cost more than I like to pay but got 24 bags at special Walmart price.

Helpful?3WCUT2OA5SK16946252118
Jun 20, 2026
Reviewer name: Cheryl
Top Reviewer
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

HTH Shock is the best value for the money. Much less than the popular competitive brand, but does a job equal to or better. The individual packets inside are nice and full and the granules dissolve easily. An absolutely great product!

Helpful?3WCUT2OA5SK16946252118
May 9, 2025
Reviewer name: John
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

HTH Pool Care Shock is good but the HTH Pool Care Shock Advanced is even better and that's what I use. It cleared up an old in ground pool with a persistent algae problem and left no shock residue on the bottom like other shock treatments, Advanced rules !

Incentivized Review
Helpful?3WCUT2OA5SK16946252118
Current price is $57.3129.8 ¢/oz
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