Engineered High Density POLLY ROCK.

These cost around 350 plus each so this is under half price

500mm thick 1.2w and 3m long (1.8 cm3) This stuff is perfect for any type of bulk fill. Use against retaining walls to reduce the pressure against it or used as bulk fill when you need to bring in lots of gap/crushed concrete to get to height. Use this and save money instead of barrowing in hundreds of loads metal and the hassle of compacting it several times before you need a geotec. This stuff you just place it down and walk away. No compaction needed. Have receipt from placemakers to show what it is to give to any engineer that requires it. No compaction needed.