Lally column

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A true lally column is steel tube filled with concrete. But the term is sometimes used with other types of columns.

But I don't know how water would ever get in them in the first place.

The post in these pictures with the red primer are the lally columns. Is that what you have?

http://www.jaygaulard.com/blog/2006/09/05/installing-lally-columns-and-footings-for-girder-beam/