Melt-blown filter layer and electrical grid: what they have in common

1. Step 1. Melt-blown filter layer — is part of — Respirator. An electrostatic precipitator.
2. Step 2. Respirator — is made of — Activated carbon. The filter is activated carbon.
3. Step 3. Activated carbon — is a kind of — Carbon. Porous carbon.
4. Step 4. Carbon — is used in — Hall–Héroult process. The electrodes for smelting aluminium are carbon — they slowly burn away.
5. Step 5. Hall–Héroult process — uses — Electrical grid. It needs enormous amounts of electricity.

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