It is a plastic grid. http://www.collins-consulting.org/orchids/eggCrate.jpg
You can cut it to the size of the part you want to block of and put it in there and then tie it down somehow...??.... I know it would work but have no idea how to keep it in place...Its nice to use because allows water flow
You can cut it to the size of the part you want to block of and put it in there and then tie it down somehow...??.... I know it would work but have no idea how to keep it in place...Its nice to use because allows water flow