I work in the tunnels of the Denver International Airport. Here’s a pipe with 30 years of calcium build up.

    by OOzder

    23 Comments

    1. Our water heater feed pipe was so clogged with hard water buildup that you couldn’t see through it. Obviously water could still flow (slowly) through it, but if we hadn’t replaced it when we did it would have clogged up solid at some point.

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