Assertion: water heater's water | /r/HasProperty | hard
Facets:
Source sentences:
text: A water heater that uses hard water or well water should be drained, or flushed, about once a year to help extend the life of the tank.
text: This popping noise is from an accumulation of honeycombed mineral sludge, caused when that water heater has to take on hard water.
text: This is probably the most widely used metal in modern water heaters, although it is not very good in places where the water is hard.