The German Coffee Association recommends 60g of coffee per litre of water. This also applies to preparation using the X-Tract method. As a rough measure, we use approx. 6g per heaped spoon at home. This means as a guideline
8 spoons for a full arca (add approx. 800ml of water)
5 spoons for 1/2 litre of water
3 spoons for 300ml of water (one large cup)
If your coffee is too weak and it is not due to the amount of coffee, you have probably brewed the coffee too slowly. This means that the water is flowing too slowly and the coffee is not mixed thoroughly. If the coffee is too strong, simply reduce the amount of coffee powder or choose a milder, fruitier roast with a coarser grind. Experiment a little until you have found your perfect setting.