HTH Pool Shock, Cal Hypo Formula, 13.3oz, Pack of 2 | Swimming Pool Care | Chlorinator | Boosts Chlorine Levels

I used this last year after coming home from a long international trip to a completely green pool and really I was impressed with how well it worked. My pool had been neglected for over two weeks while I was away and by the time I got home the water was fully green with visible algae growth. I added two bags of this shock around the perimeter of the pool in the evening with the filter running and brushed the pool afterward to help make sure everything dissolved completely. By the next morning, the pool had already changed from swamp green to a cloudy blue. It was not crystal clear yet, but the algae was clearly dead and the transformation overnight was dramatic. At that point I backwashed and rinsed my sand filter and a crazy amount of algae flushed out. I continued filtering nonstop, brushed the walls again, skimmed debris, and used socks over the inlet ports to catch the finer dead algae particles. Throughout the day the socks kept collecting thick layers of fine algae residue so I rinsed them several times as the filter continued running. By the following morning I could clearly see the liner pattern at the bottom of the pool again. After another day of backwashing, brushing, vacuuming, skimming, and filtering, the pool was completely clear and ready for the family to enjoy again. I think it’s important to mention that bringing a green pool back takes patience no matter what brand of shock you use. This is not an instant one-hour fix but the product absolutely did its job and worked quickly once the filter system had time to remove all the dead algae. For reference, I used this in a soft sided above ground pool with a sand filter system. The attached photos show the pool before treatment, the morning after shocking, the second day of filtering and cleaning, then the final clear result on day 3. Pros: Worked quickly on a severely green pool Noticeable overnight improvement Killed algae effectively Dissolved well after brushing Worked well with a sand filter setup Cons: Restoring a neglected pool still takes time and repeated filtering/backwashing

The HTH 52031 Pool Care Shock worked very well for quickly clearing up cloudy water and boosting chlorine levels in our pool. After using it, the water looked noticeably cleaner and fresher within a short amount of time. The product dissolves fairly quickly and was easy to apply following the directions on the package. It helped control algae and that strong “pool smell” that usually happens when chlorine levels are off balance. I also liked that it restored water clarity without requiring multiple treatments. This shock treatment is especially useful after heavy pool use, rainstorms, or hot weather when chlorine levels tend to drop faster. The packaging was convenient, and the product feels reliable for regular pool maintenance. Pros: Quickly boosts chlorine levels Helps clear cloudy water Effective against algae and odors Easy to use Good for routine pool maintenance Cons: Strong chlorine smell during application Best results require proper water balance and testing Overall, this is a dependable pool shock treatment that helps keep pool water clean, clear, and swim-ready with minimal hassle.

I recently used the shock to get my pool back in shape, and it worked exactly as expected. The Cal Hypo formula is potent and noticeably boosted the chlorine levels in my pool within just a few hours. It cleared up the water quickly, removing the slight cloudiness I had been dealing with. The packaging was sturdy, and the product was easy to pour without creating too much dust. Given the price point, this is an excellent value for money compared to other brands I’ve tried. I’ll definitely be keeping a few packs on hand for regular maintenance throughout the season. Highly recommend for anyone looking for a reliable, fast-acting chlorine boost.

I've had excellent results with this HTH pool shock. It dissolves quickly, boosts the chlorine level fast, and does a great job clearing up cloudy water before it turns into a bigger problem. The individual packets are convenient because there's no measuring or mess. It's become part of my regular pool maintenance routine, and my water stays clean and sparkling. Great value and a product I will definitely continue to buy!

Works fine when new. I found out what happens when the product is exposed to heat. My pool supplies are outside in a cabinet but away from direct sun. The Vegas heat turns them into a gooey mess, then it won't dissolve. So, just keep it indoors, climate controlled.

Works well and is easy to use. It helped keep my pool water clear and fresh. I’m happy with the results.

This stuff is great! Cleared up my pool in one day.

Used this up so quickly but it made my pool swim able and fresh. It was easy to use and the odor smelled like a clean pool. It’s not cheap but worth it for peace of mind.

It works perfectly to keep my pool clean

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