This one puzzles me.
The gf occasionally makes coffee or tea at her office and uses a bonavita electric kettle to heat a couple 8 oz bottled water from arrowhead (delivery brings them individual water bottles, not the big coolers jugs). After a few days, the base develops "spots"; these spots aren't like any deposits I've seen.. they look more like mold spots. It took some scrubbing to get them off. So last time, I suggested she leave it be. A few months later, there were strands of some "growth", looked like mini swamp-thing algae.
Contacted BV, and they sent a replacement kettle a couple weeks ago. Brand new kettle, washed it well, brought a few liters to water to boil, then relocated to her office, and after one day use, already has the spots. I have a BV kettle in my office too, but no spots, and my office is across the street from hers.
Any idea? Should she change her water source? Is her office possibly contaminated with air-based pollutants? Will she mutate into a toxic avenger, seeking revenge against stingy landlords to promote tenant improvements through negotiations, thus making the world a safer place to rent?