Works well

Beautiful Swimming Pool

Just what we needed.

Good value

Was just sitting next to my pool checking to see if sams club still had this chlorine in stock and seen all the negative reviews. I've been very happy with results from using this chlorine. Most granular pool chlorine that you find at regular stores (meaning not a pool store) will be a calcium based chlorine which is typically for use in concrete pools, the calcium chlorine shock gives you're pool water a milky look until it's completely dissolved and if you read the label is mostly filler or the term on the package "other ingredients" This members mark brand is sodium Dichloro-s-Triazinetrione Hydrated Which has 99% active ingredients and only 1% filler or "other ingredients" with 55.5% available chlorine So this is actually some pretty good stuff especially for the cost of the product. So I'm Not sure what's up with all the negative reviews other than there's a lot of people out there that don't understand pool chemicals and how to properly maintain a pool. I'm happy and will be buying another box of this which should get me through the rest of this summer

Careful using this for shock. I don't know if it was this batch or if they changed their formula, but after 3 bags my cyanuric levels went from 30 to 150ppm in a 20,000 gallon pool. Put my pool in a chlorine lock! I had to drain half the pool and refill. Luckily it did rain for a week! I never add chlorine stabilizer because it's always in the pool and in my tablets.

Will it raise your chlorine levels for testing? Sure. For a day, then they're down again. I had crystal clear gorgeous water until I tried to save money and switched to this brand. Now I have green algae, cloudy water. I've done nothing different except switch to this brand of shock. I'm so disappointing!! Do not recommend.

I've been using pool store shock for years and have been fighting a small algae growth this summer. Bought Member's Mark Quick Dissolving Shock Stabilizer and the algae was GONE after the first use! Cleared up my algae problem and saved me money! Win Win!!

I’ve been using this shock for a while in my pool and have never had any issues with algae or it not keeping my pool crystal clear. This combined with the tablets is the perfect combination. I’ve been using the members mark pool tablets and shock for up to 15 years and I’m very satisfied with it. I’d upload a picture but can’t get it to download on the site.

This is 'Stabalized' shock which you will find you now have a major problem. It will raise your Cyanuric Acid to levels waaaay beyond what they should be. Mine went off the scale 300ppm, so I had to drain 10,000 gallons off my 30,000 gallon pool and that only brought my Cyanuric Acid down to 100ppm. I am now only chlorinating with liquid Chlorine hoping my CYA will continue to drop but I am afraid I'll have to drain again. UGGH!. With a CYA level so high your Chlorine will lock and stop working and you'll wonder why the algae will continue to flourish. It becomes a bad cycle. Don't use this shock... run away... far far away!