Flow is how easily water moves through the coffee in your pod.
If the grind is too fine, water struggles to pass through. You’ll see slow dripping, stalling, or the machine stopping.
If the grind is too coarse, water rushes through and the coffee tastes weak and watery.
You’re aiming for a steady, even flow.
For best results, use a fine-to-medium (stovetop) grind, which is ideal for reusable pods.
If you are grinding your own coffee:
Too slow → go a touch coarser
Too fast → go a touch finer
A note on pre-ground coffee
Supermarket coffee is finely ground for pump espresso machines. This grind is generally not suitable for any reusable pods and will restrict water flow, regardless of how firmly or loosely the coffee is packed.
For best results, use freshly ground coffee at a fine-to-medium (stovetop) grind, or coffee specifically ground for reusable pods. This grind allows water to pass through the coffee at the right speed, producing a balanced extraction and better flavour. The upside of reusable pods is that you’re not locked into a single brand or blend. You can buy coffee ground to order from your local café, or choose a coffee specifically ground for reusable pods. Many cafés will grind coffee for you at the time of purchase, or you can use a simple home grinder and grind your coffee fresh.
Using the correct grind size makes far more difference than tamping pressure or fill level.