The capsules are not pierced when they are inserted. They are pierced on the back but not in the foil. The foil is pierced when the hot water is injected through the posterior holes and the pressure causes the foil to bulge, thus getting pierced by the grid in the front of the machine. If the capsules are not getting pierced it means that the water is not being injected with enough pressure. This could be due to hard water deposits. Try first to pump the machine by turning it on and then lifting the lever and keeping it raised for a few seconds. If that doesn't work, de-scaling the machine should correct the problem.
Some coffee machines have the option to either use ground coffee and filters or coffee pods. These are small, sealed containers that have the ground coffee inside. You insert the pods into the machine and click them into place. The machine pierces a hole and the water drips through. It's a much tidier way to make coffee especially if you don't drink a lot of it, so you don't want a whole jug full, rather just one cup at a time.
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My pods are not fully pierced in the back of the pod, this is through the metal, not the foil in front.
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