Hard water. Please help! What is this?

[Keith Smith]

Hi,

I have no plumbing experience but recently saw this at my sister's. What is this and what causes it?

Thanks Keith

 

[WorthFlorida]

High level of calcium and other minerals in the water, (very hard water).

 

[Sponsor]

 

[Keith Smith]

High level of calcium and other minerals in the water, (very hard water).

Thank you.

 

[hj]

And a very low quality faucet.

 

[Mliu]

And your sister not cleaning her lavatory.

 

[HudsonDIY]

Pour some vinegar on that thing before it eats someone.

 

[Reach4]

Pour some vinegar on that thing before it eats someone.

A new faucet would usually be fairly cheap and easy if the faucet is connected with flex lines.