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Your ROK is covered by a 10 year warranty on defects. Download your 10 year warranty
For all ROK and Presso warranty issues please contact the manufacturer
2 Scala Street
TELEPHONE: +44 (0) 207 927 9948
VAT: GB 830 5831 41
Reg Number: 04403813
Safety and Maintenance
We’d love for you and your ROK to enjoy a long and happy life together. To that end you’ll find safety and maintenance tips below which will ensure the longevity of your ROK.
Don’t grind your coffee too fine
Using overly fine coffee can lead to damage and breakage of the internal plastic components and in extreme cases snapping one or both levers. Do not apply excessive force to your ROK. It is not necessary to apply great force to produce great shots of espresso.
We recommend starting with a coarser grind and experiment, gradually moving to a finer grind. The aim is to have a stream of coffee which looks more like honey than a gushing torrent. A grind which is too coarse results in a “gusher” and will likely taste awful.
Grinding coffee too fine can “choke” the ROK. This means that regardless of how much pressure is applied to the levers, very little to no coffee comes out the bottom. If your coffee seems very restricted and comes out in drips (or not at all), you’re grinding too finely. Try a coarser grind.
Typically, the espresso grind you get from a grocery store or cafe is too fine. If you’re buying pre-ground coffee from a cafe, ask them to grind it one or two steps coarser than espresso. If you’re using the grinder at your grocery store, set it one or two steps coarser than espresso.
Symptoms of internal damage include pressure loss i.e. air escaping from the top of the ROK while pressing a shot. In most cases this can be remedied with a replacement o-ring and/or plunger.
Don’t crank the portafilter in to place
The portafilter will lock in position using only moderate force. “Cranking” the portafilter in to the lock position can damage the main plastic cylinder and in extreme cases damage the portafilter itself.
If you find the portafilter is unwinding as pressure is being applied during a shot, you need only clean the coffee oil and residue from the groove that the portafilter slots in to.
Don’t put it in the Dishwasher
Don’t soak it with denture tablets
Don’t use abrasive scouring pads on the outside of the ROK
Give Your ROK Some Love
Dry your ROK thoroughly after each use
This will help you maintain the shiny finish to the body of the ROK. It also reduces the chances of mineral build-up (limescale) and resulting corrosion.
Allowing water to sit on the body of the ROK will, over time, tarnish the finish and create water marks which can be difficult to remove.
Cleaning the portafilter
Coffee residue can build up under the basket in the portafilter. Take the basket out when cleaning your portafilter.
Removing limescale (mineral build-up)
If you notice mineral deposits around the rim where the aluminium frame meets the plastic cylinder, it’s time for a little maintenance. Failing to remove mineral deposits can result in corrosion and permanent damage.
To make it easier to access, you can easily take out the main chamber. This only requires that you undo the main screw (joining the levers) at the top of the ROK. This will allow you to take out the plunger and the plastic cylinder should just twist and pull out.
The unpolished aluminium inside the ROK may also have mineral deposits. You can use a light abrasive scouring pad to gently clean the inside. Take extra care when cleaning the top rim not to scuff the outside of the ROK.
Polish your ROK
If you really want to bring the sparkle back to your ROK you can use aluminium polish.
Making Better Shots
Use fresh coffee and if possible, grind right before making a shot.
For an average coffee dose of 16-18 grams (about two ROK scoops of whole beans), your resulting shot should be between 1 and 2 ounces (30-60ml). Running shots too long can lead to excessive bitterness. Too short and your shot may taste acidic (some folks prefer this). Your shots will vary depending on the coffee you use. Experiment to find a ratio that works for you.
Have fun and enjoy your coffee.