Water – New submersible water pump has rust

pumprustwater

I installed a submersible water pump in our drinking water cistern less than six months ago and today when I looked at it, I noticed it has significant amounts of rust close to the housing divisions.

Also I don't know what the white substance is, but it could be from the outer coating of the hose.

Is this something to worry about?

Water pump showing rust around the lower part of the housing

Water pump showing rust around the lower part of the housing (close-up)

Best Answer

Perfectly normal for non-stainless steel pumps to rust.

Even stainless steel ones may rust, slightly.

The white corrosion may indicate some cast aluminum components, and if so, the combination of aluminum and iron components would also tend to promote galvanic corrosion.

It's not a cause for great concern - it's primarily cosmetic. It does lead me personally towards choosing stainless steel pumps, but cast iron pumps that look awful will work for a long time, looking awful. They do become difficult or impossible to disassemble eventually, but that's over a fairly long lifetime.