Nam capsula testa, quia aluminium, aluminium in infinitum recyclable materia.
Capsula capulus plerumque utitur aluminium armamentis. Aluminium est materia nunc maxime tutela. Odorem capulus cohibere non potest, sed leve pondus et robur alte. Simul, aluminium protegit capulus ab substantiis externis ut oxygeni, humorem et lucem. For coffee grounds, you can leave them untreated, but dry them and recycle them with the capsule shell; I usually use them as fertilizer for flowers.
What to do with recycled coffee capsules?