Steel Woven Mesh

This mesh is incredibly tightly woven so even the tiniest ants can't get through, It can be used in many DIY situations such as the making of a water tower, a mesh lid, or other purposes. 

A 10cm x 10cm piece is $4.99 

Calculate your total area needed and buy however many 10x10 pieces you need.

Here is a photo of a Pogonomyrmex occidentalis worker on the mesh, as you can see, there is no chance of her getting through.