pergola posts

Hi All, Thanks for stopping by. I'm soon to be building a 4m x 3m lean-to pergola in my garden which I will affix to a masonry wall. This wall is the end of my detached garage which i have converted into garden room with patio doors opening onto a deck and is approached side-on. The idea is...

Hi, I have bought a 3mx3m metal pergola and the 4 downposts are around 4" square and hollow, rather than fixing the posts can anyone suggest what I could use as ballast to put inside the posts just to weigh them down? Sand would seem the obvious choice but wondering whether that would corode the...