A couple of years ago I had a new lawn laid. The people doing the work levelled it with some new top soil they bought in.
Before hand I had never had any casts problems but in the last couple of years they have grown out of proportion. I have more casts than grass. The grass is dying off and I am being left with just bare soil. People I have spoken to have suggested that the soil that was used was not sterilised. Are there any long term solutions?