Introducing the Apax Ion Chart

In previous posts, we delved into the individual roles of ions in coffee brewing and their distinct impact on flavour. Each ion plays a unique role in shaping the coffee experience, but our research uncovered an important insight: certain ions overlap in how they influence key attributes such as brightness/acidity and body/mouthfeel.

To simplify this complexity and represent it visually, we developed the Apax Ion Chart, a framework that graphically maps these ions based on their sensory contributions. This chart highlights the core ions essential to coffee brewing water and plots them using two axes:

• The X-axis represents the ion's contribution to body and mouthfeel, with higher values indicating a heavier, more full-bodied brew.
• The Y-axis measures the ion's influence on brightness and acidity, with higher values signifying a brighter, more vibrant cup.

For example, an ion positioned at (2, 5), such as Magnesium (Mg), offers a moderate boost to body (2) but significantly enhances brightness (5). Similarly, an ion at x = 5 contributes substantial heaviness and depth to the brew, making its role key to creating a fuller-bodied coffee.

Understanding the Ceiling Effect: Striking the Right Balance

Through years of research, we’ve learned that while each ion has a positive role, there’s a limit to its beneficial impact. Beyond a certain concentration, ions can lead to diminishing or even negative results. The sensitivity of each ion varies—much like seasoning in cooking.

Think of it this way: you can add a generous amount of salt to enhance a dish without overwhelming it, but the same isn’t true for chilli flakes or black pepper. Some ions, like Magnesium and Chloride, have a higher threshold, while others, such as Sodium or Bicarbonate, require much more precision to avoid tipping the balance.

Visualising Maximum Concentrations with Triangles

To illustrate this concept, the size of each ion's representation on the Apax Ion Chart corresponds to its maximum recommended concentration:

• A small triangle indicates a low ceiling—this ion is potent, and only a small amount is needed before negative effects emerge.
• A large triangle signifies a higher ceiling, meaning more of that ion can be used effectively without compromising the coffee’s quality.

This visual representation not only makes it easier to understand but also highlights why balance is critical. It’s not just about having the right ions; it’s about ensuring they’re present in the correct amounts and proportions.

Precision in Practice: The Core of APAX LAB Profiles

This understanding of ion limits and interactions is the foundation of our Apax Lab mineral concentrate profiles. With an unwavering focus on precision and balance, we’ve developed profiles that optimise these ions to enhance coffee’s best attributes while avoiding excesses that could negatively impact flavour or texture.

The Apax Ion Chart is more than just a visual tool; it’s a guide to crafting water that brings out the very best in coffee. Whether you’re a barista or a home brewer, it’s a tool designed to help you elevate your brewing water to a professional level.

Stay tuned as we dive deeper into how you can use the Apax Ion Chart to tailor your water profile and unlock the full potential of your coffee.