Regenerator checkerwork and sewage treatment plant: what they have in common

1. Step 1. Regenerator checkerwork — is part of — Open-hearth furnace. Checkerwork heats the air and gas with the heat of the exhaust gases.
2. Step 2. Open-hearth furnace — is made of — Brick. An open-hearth furnace is built of firebrick.
3. Step 3. Brick — is material for — Sewerage. The drains of Mohenjo-daro are lined with fired brick.
4. Step 4. Sewerage — has part — Sewage treatment plant. Treatment plants.

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