In The Swim Sodium Dichlor Chlorine Shock Granules for Sanitizing Swimming Pools – Fast Dissolving, pH Balanced Sanitizer - 56% Available Chlorine, 99% Sodium-Dichlor – 40 Pound
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This item is eligible for return within 30 days of receipt
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Availability:
20 left in stock
Arrives
Jul 11 – Jul 12
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Size: 40 Pound
Features
- Versatile: Granular chlorine with the ability to be used in all types of swimming pools, spas, fountains, and water features.
- Powerful Sanitizer: Sodium Dichlor shock removes bacteria, breaks down organic contaminants, and eliminates algae.
- Calcium-Free Formula: Perfect for hard water areaskeeps pool water sparkling clean and crystal clear.
- Stabilized Chlorine: Contains 56% available chlorine for effective, long-lasting sanitation.
- Usage Directions: Add 3 oz. per 10,000 gallons for routine chlorination; use 21 oz. per 10,000 gallons for super chlorination
Brand: In The Swim
Item Weight: 44 Pounds
Item Form: Granular
Product Benefits: Kills Bacteria, Maintains Clean Sanitized Water
UPC:
Brand Name: In The Swim
UPC: 803354120765
Number of Items: 1
Unit Count: 640 Ounce
Model Number: C4045
Manufacturer Part Number: C4045
Manufacturer: In The Swim
Item Form: Granular
Product Benefits: Kills Bacteria, Maintains Clean Sanitized Water
Item Weight: 44 Pounds
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jul 11 – Jul 12
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 40 Pound
This is a wonderful chlorine for our 35000 gallon in ground pool. Shock at night works great but when the sun shines, use this stabilized chlorine. You have to keep track of the cyuranic acid because this chlorine adds to that chemistry. Great price and buying in bulk makes sense and saves quite a bit in the long run.
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Reviewed in the United States on May 21, 2026 by Paul R. F
Size: 40 Pound
After years of paying $40+ for 5lbs of Spa 56 from Leisure Time and being mostly satisfied, I ran into the problem this year of the bleach shortage and could not find the stuff anywhere...which is what forced me to just say what the heck and invest in the most giant tub of granules I could find just to avoid dealing with the shortage. Mind you, a 5lb canister of Spa 56 lasted me around 1 year, so this would last me likely 8 years at least and at $140 that's still a deal. So, I expected this to be bottom barrel stuff considering the price and what I got was a product that works in my hot tub much better than Leisure Time did. I'm using less of this, less often, and getting better results. It lasts longer, and is far more stable. I'm no chemist, or pool/spa professional, but I can tell you that I'm using this less, it smells more like a spa/pool smell and feels better in the water. With Spa 56, if I missed a day late or two from the usual treatment regiment routine, it would cause an unbalance. Spa 56 was very unstable, it seems. I was just so used to using it, I never noticed. If I was 2 days late, usually my tub would start smelling like old socks. I have been 3 days late with this already and the test strips all still read fine. Sure, the chlorine levels were a little low, but I've still got a nice clear water and no smells. Maybe its not the right fit for everyone, so I won't sit here and tell you to stop using what you're using and get a 40 lb tub of this, but if you want to grab a smaller portion and give it a go, you may be pleasantly surprised. Based on the rate I'm using this, I'm looking at a good decade or more off this one bucket.
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Reviewed in the United States on October 24, 2020 by Strike Commando
Size: 5 Pound
Great for my hot tub. Two small scoops about once a week during summer and every two week in winter. One bucket lasts about a year
Reviewed in the United States on April 30, 2026 by Randy Garms
Size: 5 Pound
Works well for our pool and the price is right .
Reviewed in the United States on December 30, 2025 by Lj
Size: 5 Pound
Quick and efficient delivery. Product was exactly as I ordered.
Reviewed in the United States on January 16, 2026 by DrPurple
Size: 40 Pound
Buy again
Reviewed in the United States on April 3, 2026 by Al Woodall
Size: 25 Pound
Works great. Easy to open. No complaints. 2-3 times we’ve ordered it
Reviewed in the United States on September 27, 2025 by pete Brannam
Size: 10 Pound
Works good but for the price . Thought I would have gotten more than that.
Reviewed in the United States on June 4, 2024 by david kerr