Endurance Formula Cartridge

Endurance Formula Cartridge


Replaces the electrolytes lost during exercise delivered through the Cirkul System.

Flavor: Strawberry Watermelon
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No Artificial
No Artificial
Filtered Water, Natural Flavors, Citric Acid, Sodium Chloride, Calcium Lactate Gluconate, Monopotassium Phosphate, Sodium Citrate, Stevia, Magnesium Glycinate, Sodium Benzoate (To Preserve Freshness), Potassium Sorbate (To Preserve Freshness)

Designed to Perform

The Stage Hydration Endurance Formula is packed with electrolytes to hydrate and boost your performance.

Backed by Science

Our formula mirrors the ratio of electrolytes in sweat for optimal rehydration.
The Cirkul Hydration System

Hydration Made Easy

The Cirkul System is the ultimate hydration tool for athletes that want efficiency, flexibility, and convenience.
  • No Artificial Sweeteners
  • No artificial Colors
  • Keto Friendly
  • Gluten Free
  • Dairy Free
  • Vegan

Dial in Your Performance

Adjust your cartridge to customize your electrolyte flow. A higher setting means more electrolyte consumption. Each cartridge can last from 1 bottle to 20+ bottles depending on your performance and hydration goals.
Hydration Dial Illustration
Hydration Level Table


Using the system is incredibly easy:

1 - Remove the Stage cartridge from package

2 - Shake the cartridge well

3 - Thread onto the Cirkul cap

4 - Fill bottle with water and thread on the cap

5 - Use the dial to adjust the flavor and electrolyte consumption

6 - Enjoy and make sure to recycle when done!

TIPS FOR BEST PERFORMANCE - Shaking the cartridge in between fill ups helps our electrolyte packed formula flow best. Also make sure that the small silicone valve under the cap has a fully cut "X" in it, high quality silicone has a knack for healing itself!

Once opened, you can leave a cartridge right on the bottle. It is not recommended to store below 40°F or above 90°F for extended periods of time.
The Cirkul cartridge flavor dial enables a customer to get anywhere from 1 to 20+ bottles from one cartridge. Our flavors were designed based on a flavor setting of 5 - 7, which based on normal usage patterns will provide 4 bottles of flavor.