Correctly setting the grind size to fine salt is the first and most critical step to obtaining quality espresso in a carob coffee maker. If the particles are too large, the water will pass through the tablet too quickly, resulting in a sour and watery drink, while grinding too fine will result in over-extraction and bitterness. It is the balance of the grain fraction that determines the pouring time, which ideally should be 25-30 seconds for a double portion.
The cooking process begins long before you press the start button, since the stability of temperature and pressure inside the system directly depends on preheating. A cold horn or unheated group will take heat away from the water, which will disrupt the chemical process of extracting the aromatic oils. Therefore, a professional approach requires mandatory heating of all contacting elements before each welding.
Equipment preparation and water selection
Water quality makes up more than 90% of the cup's volume, so using tap liquid often defeats the purpose of selecting a premium grain. Hard water quickly forms scale on heating elements and clogs the thin channels of the hydraulic system, which reduces pressure and worsens the taste of the drink. The optimal solution is to use bottled water with total mineralization (TDS) in the range of 75-150 mg/l.
Before starting work, make sure that the reservoir is full and the drip tray is empty to avoid overfilling and water entering the device body. Turn on the coffee maker in advance, giving it 10-15 minutes to fully reach operating mode, since the readiness indicator often lights up before the metal boiler warms up.
Immediately before grinding the grain, it is recommended to pass an idle stream of hot water through the group. This simple manipulation stabilizes the temperature of the brewing unit and washes away possible residues of the previous brew, ensuring purity of taste.
Subtleties of grinding and grain dosage
For carob coffee makers operating under a pressure of 9 bar, only fresh coffee is required, roasted no more than a month ago, since old beans lose carbon dioxide and do not provide the necessary cream. The degree of grinding should correspond to the type of cone used: non-pressurized requires a fine espresso grind, while double-bottom (pressurized) requires a coarser grind.
The dosage of grain plays a key role in the formation of the correct “pill”. If you add too little coffee, the water will follow the path of least resistance through the edges, eroding the walls. Excess grain will cause the tablet to push against the shower screen when closing the wand, causing uneven wetting and possible flow interruption.
Use a kitchen scale to accurately measure grains. A standard double serving is usually 18-20 grams, but the exact weight depends on the size of your basket.
Distributing the coffee evenly in the basket before tempering prevents the formation of channels through which water passes faster, washing away under-extracted particles. To do this, you can use the WDT (needle fluffing) technique or simply tapping the horn on the palm of your hand to eliminate any air pockets within the mass.
Tempering technique and horn installation
Tempering is the process of compacting a coffee tablet to create resistance to the flow of water. The pressure you apply should be just enough to remove air and level the surface, but not necessarily extreme. The main thing is to make the surface strictly horizontal so that water passes through the entire area evenly.
After compaction, it is important to immediately install the horn into the group, without tapping it on the table or palm, since vibration can disrupt the integrity of the compressed layer and create microcracks. Insert the horn into the group and turn it all the way, making sure that the handle is in a position that is comfortable for you.
☑️ Checklist for ideal preparation
There is a common misconception that the harder you press with the distemper, the better. In fact, what is more important is the resistance force created by the grinding structure itself, rather than the physical effort of the operator. Excessive pressure can cause over-compaction and longer pour times, making the coffee bitter.
Extraction process: time and temperature
Start pouring water and carefully watch the stream coming out of the spouts of the horn. In the first few seconds it should be dark and thick, then lighten and acquire a brindle color. The ideal extraction time for a double shot (about 36-40 ml of finished drink) is 25 to 30 seconds.
If the stream flows too quickly and the coffee is light, you need to reduce the grind. If it drips slowly or stops altogether, increase the fraction. This option is the main lever for controlling taste in the hands of the barista, allowing you to adjust the balance of acid and bitterness.
The temperature of the boiler water also affects the result: light roasts often require a higher temperature (around 93-95°C) to bring out the acidity, while dark roasts do better at 90-92°C to avoid excessive bitterness. Some advanced models allow you to adjust this parameter through the menu.
Preparation of milk drinks
To create a cappuccino or latte, you need to properly froth the milk, saturating it with air and creating a fine bubble structure. Use cold milk (preferably 3.5-4% fat) and a cold pitcher. Place the steamer just under the surface of the milk and turn on the steam at full power.
At the first stage, aeration occurs - a characteristic “crackling” sound when air enters the milk. Once the volume increases by 20-30%, lower the pitcher deeper to swirl the milk into a vortex. This will break large bubbles and heat the drink evenly to 60-65°C.
Immediately after whipping, tap the pitcher on the table and make a few rotational movements to remove any remaining large bubbles and give the milk a glossy shine. Pour the milk into the espresso in a steady motion, controlling the flow to create a pattern or simply blend evenly.
Coffee maker care and maintenance
Regular cleaning of the horn and brewing group is mandatory after each brew. Remaining coffee oils quickly oxidize and give the drink a rancid taste. Wipe the group with a damp cloth immediately after removing the horn, before the coffee residues have dried.
Once a week it is recommended to carry out dry cleaning using special tablets (backflush), if the design of the coffee maker allows this. This removes fat deposits from the internal channels and shower screen, restoring the original performance of the device.
| Parameter | Meaning/Action | Effect on taste |
|---|---|---|
| Grinding | Fine (like salt) | Extraction balance |
| Temperature | 90-95°C | Aroma Revealing |
| Pressure | 9 bar | Formation of cream |
| Time | 25-30 sec | Body Density |
How often do you change the water in the filter?
The cartridge in the filter jug or inside the coffee maker should be replaced according to the manufacturer's instructions, usually every 2 months or after 150 liters of water. Ignoring this rule will lead to rapid scale formation.
Common mistakes and their solutions
One of the most common problems is the use of a loose horn or a damaged group seal. This leads to loss of pressure and lack of cream. If you notice that water is leaking from under the horn during cooking, check the condition of the rubber gasket.
⚠️ Attention: Never leave a coffee cone inside the group after turning off the coffee maker. Cooling moisture and compressed coffee can “boil” and tightly press the horn, as well as cause metal corrosion.
Another mistake is reusing an already brewed tablet. Coffee contains no beneficial substances after the first pour, and repeated extraction will only draw out harmful compounds and tannins, making the drink extremely unpleasant. Always use a fresh batch of ground grains.
The quality of espresso depends 80% on the freshness of the beans and the correct grinding, and only 20% on the capabilities of the coffee maker itself.
Check the cleanliness of the steam tap regularly. If milk has dried inside the spout, it will interfere with the steam flow and may end up in the drink the next time you whisk. Clean the steam duct immediately after each use with a damp cloth.
FAQ: Frequently asked questions
Why does the coffee flow too quickly and without foam?
Most likely, your grain grind is too coarse. Try setting your coffee grinder to a finer grind. The cause may also be insufficient coffee in the cone or poor tempering.
Can I use ground coffee from the store?
Yes, you can, but the result will be worse than with freshly ground grain. Store-bought coffee has often already lost some of its aromas. If you use it, choose a grind specifically for espresso machines.
How often should decalcification be done?
The frequency depends on the water hardness. On average, the procedure is recommended to be carried out once every 2-3 months with active use. The coffee maker itself can signal the need for cleaning with an indicator.
Why is the ready light on but the coffee is cold?
The thermoblock or boiler needs time to completely warm up the metal parts. Wait 10-15 minutes after turning on and let the water flow through the group before cooking.