Bar screens and sonar: what they have in common

1. Step 1. Bar screens — is part of — Sewage treatment plant. They catch large debris.
2. Step 2. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
3. Step 3. Compressor — is part of — Nebulizer. A compressor.
4. Step 4. Nebulizer — uses — Ultrasound. Ultrasonic nebulizers.
5. Step 5. Ultrasound — is used in — Sonar. Ultrasonic pulses.

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