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Sams Club
Sams Club
Customer reviews for Member's Mark Quick Dissolving Shock 20lb with 10 Test Strips for
Member's Mark Quick Dissolving Shock 20lb with 10 Test Strips
4.6 out of 5 stars
stars1,448 ratings427 reviews
  1. 5 stars81% (1,171)
  2. 4 stars9% (129)
  3. 3 stars3% (49)
  4. 2 stars2% (28)
  5. 1 star5% (71)

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Showing 21-30 of 427 reviews
Sep 14, 2025
Stephen
5 out of 5 stars review

Verified Purchase

Outstanding purchase!

I got this for like $51. The price is usually higher than this so it was a purchase I just couldn't refuse.

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Sep 1, 2025
Darren
5 out of 5 stars review

Verified Purchase

Better than others

I have been using this for years. It works better than any other brands that I have used. The price is a great value. I highly recommend trying it.

Helpful?36ZU7WJS44RT15040303929
Nov 11, 2020
T Cutrer
5 out of 5 stars review

Verified Purchase

Shocked at how good it worked!

Dollar for dollar and pound for pound I have found this to be the best shock available. Dissolves well and works great year round.

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Aug 22, 2020
Mark
5 out of 5 stars review

Verified Purchase

Not a "shock" its cheap at Sams.

This shock works good and it is very economical which is why I have been using it for about 4 years at least. I always look for it at Sams and try to stock up for the year because they do run out fairly early in the swimming season.

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Apr 22, 2022
Richard Dansby
5 out of 5 stars review

Verified Purchase

Product great-Availability bad

Member’s Mark is the best shock I have found. Availability is not so good . I like the other MM pool products and can never find them all simultaneously.

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Aug 29, 2020
SJHM
4 out of 5 stars review

Verified Purchase

Works well, but doesn’t last.

Works well and does dissolve very quickly, but doesn’t last long and I am finding that I’m having to use 2 bags 2-3 times per week in just a 15 gal pool.

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May 30, 2021
AudioNut
5 out of 5 stars review

Verified Purchase

One of the best I've used, period.

One of the major benefits of this is that it dissolves instantly. Even some of the big name shock sits on the bottom until you brush it. Excellent product at a good price.

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Jun 22, 2021
Kimberly
1 out of 5 stars review

Verified Purchase

Not the same product as usual.

The shock did not perform as expected. We’ve never had this happen before when using this product. Very disappointed. The shock must be old or the company used weaker products.

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Oct 8, 2020
Shawn
5 out of 5 stars review

Verified Purchase

Our Family's Go To Shock!

For the last 20 years I have been using shock from the local chain pool store and home improvement centers, What a difference this has made with the water quality of our pool. This is my new go to shock. We are on well water in North Texas

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Jun 4, 2021
angieb
5 out of 5 stars review

Verified Purchase

Good shock for a good price!

I picked this up in store for my vinyl-lined in-ground pool. It was less expensive than other shock I had found, but it worked just as well as any other I've used.

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