The Imants RotoKnife is a versatile, effective linear aerator. It is designed to relieve surface compaction, improve aeration, reduce thatch build up and remove surface water. The RotoKnife is fast across the surface and is also a versatile rootzone management tool. The disc Rotoshaft can be set in any of five positions offering flexibility in working depth and linear spacing. The RotoKnife is an ideal rootzone enhancement tool for both warm and cool season grasses and can even be used as a surface smoothing roller.