They are drainage grids and they are supposed to be Blue- see the picture at LancasterTElsmore wrote:They look like catch-pits with corrogated(?) lids to me, and are correct. I think that the lids are supposed to have a kind of silver-grey look to them. I have them too, so i don't think that your set-up is playing games.
Cheers
Terrone.
http://peter749.piwigo.com/picture?/289 ... ember_2016
Peter
