How to unblock for washing machine drainage Drainage and wastage systems and plumbing help, advice and answers

[wet cleaning]

Hi everone
Question is i've taken over a warehouse and i'm going to install a washing machine there is only one drain pic to follow,But there is standing water in it and a bar in the middle how do i let the water out or how do i move the bar it seems pretty solid looks like bits of plaster in there. regards stephen.

[wet cleaning]

Hi all
my question is how do i empty the water in this drain it seems like its got
plaster in there and the bar in the middle seems solid.do i turn the bar or
try and pull it out regards stephen.