The 8 Best Pool Chlorine Tablets

Updated August 03, 2017 by Chase Brush

8 Best Pool Chlorine Tablets
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We spent 42 hours on research, videography, and editing, to review the top picks for this wiki. One of the easiest ways to ensure sparkling clear swimming pool water is to add chlorine. But if you don't want to use messy liquid that can splash on your deck and bleach it, try these convenient tablets instead. They dissolve slowly to fight bacteria and algae constantly, and can be applied through a feeder, skimmer basket or a floater. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best pool chlorine tablet on Amazon.

8. Pool Mate Jumbo

For a strong and long-lasting solution to your cleaning problems, look no further than the Pool Mate Jumbo. They are slow dissolving to improve the amount of residual chlorine in your water, while still leaving it free of a chemical smell.
  • extremely potent formula
  • individually wrapped for safety
  • must apply in a floater
Brand Pool Mate
Model 1-1407
Weight 9.1 pounds
Rating 4.0 / 5.0

7. HTH 41244 Ultra

The HTH 41244 Ultra will clarify your pool while softening your water at the same time. They are great for people who have sensitive skin or children who like to play around and often open their eyes underwater, as they won't sting or irritate as much as other chemicals.
  • will prevent stains on pool walls
  • contain built-in algae fighter
  • not as strong as other tablets
Brand HTH
Model 41244
Weight 3.9 pounds
Rating 3.7 / 5.0

6. Clorox Pool and Spa 22012CLXW

The Clorox Pool and Spa 22012CLXW will protect your private lagoon from the harmful sun and keep your water free of algae or bacteria. It is available in a variety of bucket sizes, from 5 to 35 pounds, and includes all the components you need.
  • work in skimmer or floater
  • contain highly active ingredients
  • packages are difficult to open
Brand CLOROX Pool&Spa
Model 22012CLXW
Weight 13.3 pounds
Rating 4.2 / 5.0

5. Pool Mate 1-1405M

Just one of these Pool Mate 1-1405M pieces is enough to treat up to 10,000 gallons of water, giving you an efficient and cost-effective way of getting your pool ready for the summer season. They also come in a 40-pound bucket for extra large in-ground units.
  • prevent scale formation
  • reduce need for excessive chemicals
  • some tabs may be broken on arrival
Brand Pool Mate
Model 1-1405M
Weight 5.3 pounds
Rating 4.0 / 5.0

4. Kem-Tek 177

Your outdoor pool will never look clearer once you start using these Kem-Tek 177 tablets. They are comprised of a stabilized and sun-protected formula, and come in a compact one inch size, making them great for smaller above-ground swimming holes.
  • made to resist crumbling
  • keep everything sanitary
  • prevent chlorine burnoff from sun
Brand Kem-Tek
Model KTK-50-0017
Weight 4.4 pounds
Rating 4.8 / 5.0

3. Robelle 1410M

If you want to maintain the pristine state of your swimming pool, then Robelle 1410M is a smart choice. The proprietary blend of ingredients is stabilized and dissolves slowly, and can reduce the amount of chemicals needed to keep your water clean over time.
  • control algae levels
  • have a built-in clarifier
  • protect water from uv rays
Brand Robelle
Model 1405M
Weight 5.7 pounds
Rating 4.0 / 5.0

2. Rx Clear 3 Inch Stabilized

With a balance of 89 percent available chlorine and 99 percent Trichlor, the Rx Clear 3 Inch Stabilized offer an effective solution for battling the kind of algae growth caused by heavy rain and storm runoff. And, unlike liquid chlorine, they only need to be added weekly.
  • made in the usa
  • come in large 50-lb bucket
  • suitable for use in automatic feeder
Brand Rx Clear
Model pending
Weight pending
Rating 4.8 / 5.0

1. In the Swim 3 Inch

Kill all of the bacteria in your pool or spa with these In the Swim 3 Inch tablets. They are individually wrapped to prolong quality, and each piece has 90 percent available chlorine that is stabilized and extremely powerful, making them highly effective.
  • bucket comes with child safety lock
  • 114 tablets per unit
  • tabs are extra thick
Brand In The Swim
Model BLZ-5626
Weight 50 pounds
Rating 4.0 / 5.0

How Chlorine Keeps You Safe

Chlorine has been a major part of disinfecting water since the 1900s when the water companies started treating their drinking water with it for sanitation purposes. By the 1920s, pool operators learned about the benefits of adding chlorine to their swimming water to disinfect it and keep it looking cleaner, too.

When you add chlorine to water--whether it's in tablet or powder form--it forms a weak acid called hypochlorous acid that's highly effective in killing water-borne bacteria like E. coli and salmonella. It's especially important if you go into public pools since you cannot control which other swimmers are allowed in, and you cannot know what sorts of bacteria they bring along with them.

To put it in simple terms, hypochlorous is a neutrally charged acid, which means it can make contact with the mostly negatively charged bacteria, and break it down. Once inside the bacterium, hypochlorous starts to break down proteins and deteriorate the bacteria. It's important to know that chlorine doesn't work immediately, so follow the instructions about the waiting period on your tablets. It's also important to know that chlorine levels change rapidly, especially when you frequently use your pool or it rains a lot like during the summer, so you have to check levels daily.

Why Chlorine Cannot Work Alone

When you buy a pool, you're likely just thinking about cooling off in the summer and throwing parties, but you don't consider the work that goes into maintaining this big body of water. That's okay--most new pool owners don't know much about pool maintenance, but it is important to keeping the lining of your pool from corroding, which will help keep you and other swimmers safe and healthy. That's where chlorine comes in.

Before adding any chlorine to your pool, you need to test the pH levels to make sure these are correct. It's tempting to just toss your chlorine tablets into the pool and walk away, but if your pH levels are off, the chlorine will not work at its full strength and it will fail to kill all the bacteria and germs. When your pH to chlorine balance is off, you'll notice that your pool water irritates your eyes and skin. You'll also see corrosion on the handrails and other parts of the swimming pool.

Fortunately, there are user-friendly kits that let you test your pH levels, so you can make sure your pool water isn't too acidic, or too base. A safe pH level for a pool is between 7.0 and 7.6. Again, these numbers will appear on the instructions of any pH tester kit you purchase. Achieving results outside of these numbers could make your chlorine dissolve too quickly, or not at all.

The Most Popular Ways To Add Chlorine To Your Pool

If you've been in even a handful of pools, then you'll have noticed that some have little baskets floating around, some have small pods that look like UFOs, and some have a stick-shaped device that resembles an inhaler. These are the three main devices through which pool owners distribute chlorine, but you can add chlorine tablets to any of them.

Let's look at the pros and cons of each device. The small basket is called a floating chlorine dispenser or a floater. Pool experts will tell you that these are the least desirable devices since the little holes in the basket can easily get stuck on corners of the pool, and stay there for days, causing a chlorine buildup in just one area, and a chlorine deficiency in the rest of the pool. The little UFO-looking item is called a chlorine skimmer. Pool experts rank this as the second best way to add chlorine to a pool since it can't get stuck in certain areas. Water moves quickly over the chlorine tablets in skimmers, disintegrating and dispersing the chlorine evenly.

The most dependable, least-hassle tool for adding chlorine to your pool is the automatic chlorinator. Chlorinators let you add several chlorine tablets at once, and then they do the work of sending out calculated amounts of chlorine into your pool, just when your water needs it, so you don't have to think about it. Using an automatic chlorinator does not, however, mean you're off the hook from checking those precious pH levels on a regular basis.

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Last updated on August 03, 2017 by Chase Brush

Chase is a freelance journalist with experience working in the areas of politics and public policy. Currently based in Brooklyn, NY, he is also a hopeless itinerant continually awaiting his next Great Escape.

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