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

Member's Mark® 99% Pure Chlorinating Tablets make ongoing pool and spa care simpler by delivering convenient, individually wrapped 3" stabilized tablets that kill bacteria and help control algae.

3" Stabilized Tablets for Pool and Spa Sanitizing

These chlorinating tablets are compatible with chlorine-treated pools and spas and work to disinfect water by releasing chlorine as the tablet dissolves. The stabilized formula is resistant to sunlight degradation, helping maintain effectiveness even in direct sunlight and supporting more consistent water care between treatments.

99% Pure, Individually Wrapped—No Fillers

Each 3" tablet is individually wrapped to help maintain potency until you are ready to use it. The tablets are not blended and contain no fillers, giving you a convenient 99% pure tablet that helps reduce measuring and guesswork. The formula is also designed to reduce pH and leave no residue.

Clear Dosing Guidance for Routine Maintenance

• For routine chlorination, add 1 tablet per 10,000 gal. of water every 5–7 days, depending on weather and use factors.
• Apply tablets after stabilizing and balancing your pool's pH, then adjust use as necessary based on conditions.
• Use tablets as directed for disinfection, to kill bacteria, and to control algae.

Safe Handling, Storage, and Mixing Restrictions

• Wear gloves when handling the tablets, and wash hands thoroughly after use.
• Store the pail in a cool, dry, ventilated area, away from moisture.
• Do not place the pail on wet floors.
• Do not mix the tablets.

Frequently Asked Questions

What are Member's Mark 99% Pure Chlorine Tablets used for?

Designed to disinfect pool or spa water by killing bacteria and controlling algae; they’re also described as reducing pH.

Can I use Member's Mark 99% Pure Chlorine Tablets in a spa as well as a pool?

They’re compatible for use in chlorine-treated pools and spas.

How often should I add these chlorine tablets to my pool?

Add tablets every 5–7 days, adjusting based on weather and pool/spa use.

What’s the recommended dosage for Member's Mark 99% Pure Chlorine Tablets?

Use 1 tablet per 10,000 gallons every 5–7 days or as necessary, after stabilizing and balancing your pool’s pH.

Are the tablets individually wrapped, and what size are they?

They are individually wrapped 3" tablets to help maintain potency.

Do these tablets contain fillers, and will they leave residue?

They are not blended (no fillers) and are described as leaving no residue.

Are Member's Mark chlorine tablets stabilized for sun exposure?

They’re described as stabilized and resistant to sunlight degradation for longer-lasting sanitizing performance.

Are there any mixing restrictions for these tablets?

Do not mix these tablets; they’re described as pure and contain no fillers.

How should I store and handle the 40 lb. pail?

Wear gloves, wash hands after handling, and store in a cool, dry, ventilated area away from moisture; do not place the pail on wet floors.