Member's Mark 99% Pure Chlorine Tablets, 40 lbs

Member's Mark 99% Pure Chlorine Tablets make routine pool and spa care simple by providing a steady, slow-release sanitizing effect that helps keep water crystal clear.

3" Tablets for Consistent Sanitizing

These 3" chlorinating tablets are formulated to release chlorine gradually, helping maintain a more consistent level of sanitation between treatments. As the tablets dissolve, they deliver an ongoing sanitizing effect that helps kill bacteria and control algae growth that can contribute to cloudy or green water.

Individually Wrapped to Protect Potency

• Each 3" tablet is individually wrapped to help preserve maximum potency and effectiveness until you are ready to use it.
• Individually wrapped packaging supports easier handling and storage when maintaining pools or spas over the season.

Stable Performance in Sunlight

These tablets are designed to be resistant to sun degradation, helping them maintain potency even in direct sunlight. This stability is especially helpful for outdoor pools that receive sun throughout the day.

Clean Water Results Without the Mess

• The formula leaves no residue in pool or spa water.
• The tablets are safe for use and will not harm pool or spa equipment or surfaces.

Simple, Drop-In Use for Pools and Spas

Using the tablets is straightforward: add a tablet to your pool or spa and allow it to dissolve. With no complicated measurements required, these tablets provide an easy way to support ongoing water care for pools and hot tubs.

Active Ingredient Strength You Can Rely On

Active ingredient: Trichloro-s-triazinetrione 99% • Available chlorine: 90%. Other ingredients: 1% (total ingredients: 100%).

Member’s Mark Made Without Commitment™

This item meets our Member’s Mark Made Without Commitment™: Our Member’s Mark Made Without Commitment makes it easier to know what is not in our products, so members can feel better about what is. We simplify the choice for our members by setting a high brand standard for the products they bring into their homes. This isn’t just a list of ingredients, it’s our commitment to simpler ingredients that reflect our members' values. And we deliver this without compromising taste, performance, or value. This means that this item doesn’t contain the 40+ ingredients on our Made Without Commitment list like High Fructose Corn Syrup, Phthalates, Talc, Certified Synthetic Colors/ FD&C Colors, and Formaldehyde. See the full list of ingredients here: https://www.samsclub.com/cp/members-mark-goals/30001929. 

Frequently Asked Questions

What does Member's Mark 99% Pure Chlorine Tablets do for pool or spa water?

Kills bacteria and controls algae growth to help keep pool or spa water clean and clear.

Can these chlorine tablets help prevent cloudy or green pool water?

They help control algae and bacteria, which can help prevent water from turning cloudy or green when used as part of regular pool maintenance.

Are the tablets individually wrapped?

Each tablet is individually wrapped to help maintain potency and effectiveness until use.

Are these 3-inch chlorine tablets?

They are 3-inch chlorinating tablets.

Do these chlorine tablets dissolve slowly?

They use a slow-release formula that provides a continuous sanitizing effect as the tablet dissolves.

Do the tablets still work if my pool is in the sun all day?

They are designed to be resistant to sun degradation and maintain potency even in direct sunlight.

What is the active ingredient and available chlorine?

Active ingredient: Trichloro-s-triazinetrione (99%). Available chlorine: 90%.

Will these tablets leave residue or harm equipment?

They leave no residue in pool or spa water and are safe for use; they won’t harm pool or spa equipment or surfaces.

What size container does Member's Mark 99% Pure Chlorine Tablets come in?

The pail size is 40 lb, and the pail dimensions are 12.6" L x 12.6" W x 14.84" H.