Carpenters have hammers, Jedis' have light sabers and Baristas' have portafilters. Yes, the portafilter, the veritable sword of the barista. The key to your espresso machine and the device that provides transport for that freshly ground espresso to the machine used to extract the venom from the ground beans.

The easiest way to remember the name of this device is to remember its purpose as a "Portable Filter." The portafilter, or filter handle, is what most Baristaˇs should consider their most important tool. Knowledge of the terms and descriptions of the working components of your espresso machine is an important part of your espresso machine maintenance schedule. The portafilter is an integral part to making superb espresso, how you maintain it, and use it, is as important as the coffee you put in it.

The basic components of the portafilter are:
1. The portafilter body
2. The filter basket
3. The pour spout
4. The handle

The portafilters importance in the process of brewing coffee is second only to the machine that it works with. The portafilter should be kept or stored in the group head at all times. This will ensure that the portafilter is at the same brewing temp as the rest of the machine. This is an important part of the brewing process. Temperature retention through the brew cycle is very important, when using a cold portafilter remember to preheat it by running an empty brew cycle. Storing the portafilter in the group head will also reduce the time between group gasket replacement, by keeping the rubber soft and supple providing a positive seal.

The filter basket portion of the portafilter requires a minor bit of maintenance and is relatively non problematic. The filter basket is held in place by a tension spring located in a groove inside the portafilter body. Due to the constant pressure of the brewing cycle as well as hand tamping, baskets can develop hairline cracks. This causes coffee grounds to flow through to your finished shot. If you cannot see cracks, but you are getting grounds in your shots, try changing the basket. Remove the basket from the body by prying up with your thumbs or the edge of a stubby screwdriver. Care should be taken so as to not cause damage to the basket. Scrubbing the filter basket with espresso machine detergent and steel wool or a scrub pad to remove coffee oils and stains is all that is really needed to clean this part. The sealing edge of the filter basket should also be maintained. Dented or cracked edges can cause leaks at the group head and cause premature group gasket failure. Make sure there are no dents or cracks and that the knock bar on your knock box is made of a non marring resilient material.

Coffee oil build up on the surfaces below the filter basket can result in bitter or off tasting shots and can cause the the flow of coffee out of the pour spout to be uneven. Removing this residue throughout the day or a minimum once a day is an important process in the maintenance of your espresso machine. Throughout the day, scour the inside of your portafilter body below the filter basket removing any oil residue. Use a nylon or brass brush on the pour spout area and be sure to remove all debris. On a double portafilter (14-16 grams) remove spout cover and clean the inner surfaces with detergent. Removal of oil build up in the spouts will ensure even and better tasting pours.

The last component is the portafilter handle. Look at this component as the steering wheel of your espresso machine. It is important that you have a good comfortable grip and that it is in good condition. Handles should be replaced if they are cracked or have sharp edges. Handles will sometimes become loose from the body. This fix is as easy as tightening the nut holding the handle to the portafilter and replacing the end cap.

The use of detergent to remove coffee oils is highly recommended. Many commercial espresso machine detergents are available for cleaning your espresso machine. These cleaners are specifically designed to remove coffee oils from the inner workings of your espresso machine. Baking soda is also an alternative to the use of detergents. Soaking your portafilter overnight in either baking soda or detergent will aid in the cleaning process. Make sure that the cleaner you use meets the requirements of NSF.

The end result of your efforts in portafilter maintenance, should be superb tasting espresso shots, and a well maintained barista tool. The tool that makes you one with your espresso machine. The portafilter.

Terry Ziniewicz
Published in Fresh Cup 1999