Nose clip wire and plumbing: what they have in common

1. Step 1. Nose clip wire — is part of — Respirator. A snug fit.
2. Step 2. Respirator — is made of — Activated carbon. The filter is activated carbon.
3. Step 3. Activated carbon — is part of — Water filter. A charcoal filter.
4. Step 4. Water filter — is used in — Water treatment plant. Sand filters.
5. Step 5. Water treatment plant — is used in — Plumbing. Treated water.

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