The New Hotness

One of my fundamental rules is that you should never, ever look inside the water lines serving your faucets. Having recently replaced a water heater, I had to violate that rule and discovered this growth inside the flex tube at the hot water outlet:

Anything that can thrive in 120 °F water gets my grudging respect.

Scrubbing it with a toothbrush produced gray sludge that rinsed right out, so I guess it’s all good now…