Understanding Mouthfill Factor in Freediving When we talk about deep equalisation, one number matters more than most: Mouthfill Factor (MF) . It’s a simple way to understand how hard your mouthfill has to work as you descend. What Is Mouthfill Factor? Mouthfill Factor is calculated by dividing the absolute pressure at your maximum depth  by the pressure at the depth where you took your mouthfill . MF = Pressure at max depth ÷ Pressure at charge depth Because pressure increases by 1 bar every...

Water Bubbler Equalization Now that you understand how to perform the dry drills using the balloon, and can isolate and control the cheeks, jaw, and tongue, it’s time to move on to the water bubbler. The water bubbler allows us to simulate the mouthfill and experience how it will feel in the water, but in a controlled and relaxed environment. To learn any skill effectively, we need to practice it in a safe and calm setting so the brain can properly process what we’re trying to teach it. This...

In this blog you will learn how to build your own water bubbler. A water bubbler is a simple device used in freediving to train equalisation on land. It allows you to practise Frenzel and charging techniques in a safe and controlled environment, without the distractions of depth, cold, or pressure. Good equalisation comes from awareness and understanding of your anatomy and how to move it. Once you have that, the next step is repetition. Consistent, correct practice is what builds...