I have used this product for years now. Same quality as pool supply store, with the Sam's club price savings. 3 tablets are enough to chlorinate my 18,000 gallon pool for 2 weeks. Highly recommend it.

Save yourself a lot of hassle, use liquid chlorine, you'll be better off in the long run. These tablets are good quality tablets, but like all other tablets that are made with Trichlor, they also add calcium, which ends up causing your chlorine to not work over time. It might take a year, or two, but eventually you'll have to drain your pool and clean the walls to remove the calcium.

I think these tablets are low quality. They are individually wrapped which guarantees two things:1) you will get this toxic chemical on your hands, 2) the little plastic bag will create little pieces of plastic which might end up in your pool. Also, these tablets tend to be in fragments and powder. They are low quality and packaging creates frustration.

I started using the Sam's Club tablets and shock for the past two years. My pool chemistry was always fluctuating and this summer it got crazy. Appears that in Florida, where I am, you do not want to use this type of chlorine. It brings your cyanuric acid (chlorine stabilizer) up to the point where no matter how high your chlorine level that you test in your pool algae will still grow. The stabilizer will not let the chlorine do its job. After a lot of hassling and research the only way I was able to break the cycle was to put about 8 lbs of calcium hypochlorite pool shock into an 18,000 gallon pool. I did contribute to my own problem because each time I saw algae growing I would use the Sam's Club shock which just exacerbated the problem.

Since these tablets contain cyanuric acid - something I just became aware of - it completes screws up chemical levels. Chlorine will not work; the cyanuric acid does not diminish in the pool ever resulting in skin rashes and numerous other health problems. After using for 2 years, I now have to drain 75% of my pool water and refill to try to be able to fix the problem caused by this product

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I have used this for the past 3 years and have had no problem. Much cheaper than the pool store and works just as well

This is the first time we bought members mark tablets for our dispenser and after 2 weeks no chlorine detected. We thought it was our chlorinator but after inspection we found nothing wrong. Will be returning to SAMs,very disappointing.

I have been using chlorine tablets from different vendors and they all seem to do their job including the ones from Sam's. However the price went from 80 bucks (my last purchase Oct. 2020) to %100 which is a little steep...