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50+ bought since yesterday, try a subscriptionBest seller
HTH Pool Care Shock Advanced — Granules, 1 lb — Pool Shock Treatment for Weekly Use
Key item features
- Multi-functional shock treatment for weekly use
- Prevents bacteria & algae
- Use weekly to solve 90% of pool water problems within 24 hours
- Restores crystal clarity in 24 hours
- Visibly brilliant sparkle
- This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent over-stabilization or chlorine lock.
Specs
- Chemical standard typeCalcium Hypochlorite Shock
- FormGranules
- Pool chemical typeSwimming Pool Shock
- Weight1 lb
Current price is USD$4.81$4.81/lb
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Columbus, 43215
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Starting from $9.99
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About this item
Product details
HTH Pool Care Shock Advanced for Swimming Pools, Prevents Bacteria & Algae, Cal Hypo Formula, Pool Chemicals, 1 lbs
HTH® Pool Care Shock Advanced 1lb is the powerful 4-in-1 formula with Cal Hypo that kills and prevents bacteria and algae as well as reduces chlorine odor and irritation for crystal clear, healthy water. 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 formula in HTH® Pool Care Shock Advanced 1lb provides chlorination without adding extra CYA for a beautiful sparkle all season. This product is great for all swimming pool types and won't fade your pool liner.
How To Use HTH® Shock Advanced: Follow the on-pack instructions according to your pool size to add HTH® Shock Advanced directly to swimming pool water or skimmer. Make sure to use a clean, dry scoop. For best results, apply HTH® Shock Advanced as part of your weekly pool care routine to keep free available chlorine levels between 1 and 4 ppm.
- Multi-functional shock treatment for weekly use
- Prevents bacteria & algae
- Use weekly to solve 90% of pool water problems within 24 hours
- Restores crystal clarity in 24 hours
- Visibly brilliant sparkle
- This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent over-stabilization or chlorine lock.
info:
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Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
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Showing 1-3 of 1,806 reviews
Nov 11, 2025
Jodi
Top Reviewer
Item details
Count per pack: 12
5 out of 5 stars review
Verified Purchase
Pool clarity
We always use HTH shock for our pool and continue to have crystal clear water. We have tried other pool shock which messed with the chemistry and made more work if we had not tried.
Helpful?e782c080-d40b-11f0-ac61-41720b250fb9733727619
Apr 30, 2023
KK
Item details
Count per pack: 12
5 out of 5 stars review
Verified Purchase
Great product at good price!
This shock is always the best priced and always gets my pool water right. You can see how green my pool was (I haven't uncovered it yet- just trying to keep the scum/algae beat down until I have time to open it and tend to it)- I have a large inground pool (approx 30k gal) and only used 4 of the 6 bags in this pack and it turned the scum/algae from deep green (you can still see at edge above the water line) to much better lighter color in the skimmer and made the water clear. Will use again when I'm ready to open for the season (after nearby tree drops it's flowers over the next 2 weeks). I peeked under the cover and the entire pool is better at the same rate the skimmer area is better. Have used this product for years and never had an issue.
Helpful?e782c080-d40b-11f0-ac61-41720b250fb9733727619
Aug 14, 2025
CHRISTY
Item details
Count per pack: 12
5 out of 5 stars review
Verified Purchase
I think I'm a professional pool cleaner
Worked as expected and highly recommended by several people! It's breaking up the black algae slowly but surely and levels are literally perfect after one use even with all the rain! Everything is on the bottom making cleaning and vacuuming very low maintenance!
Helpful?e782c080-d40b-11f0-ac61-41720b250fb9733727619
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