Lawns where a lot of activity takes place can become compacted. Over time thatch can also build up to create a barrier, keeping water and air from reaching the roots. Core aeration reduces compaction and thatch to let air, water, and fertilizer down to the root zone. Healthy roots are essential to good lawn growth. Core aeration also stimulates root growth by "œpruning"? the roots. As an added benefit, the removed cores deposit valuable micro-organisms on the lawn surface.• Removes two 1â?„2" plugs, 31â?„2" long• Reduces soil compaction, water run-off and puddling• Lets air, water and fertilizer down to the roots• Breaks down thatch• Promotes vigorous root growth, strengthening tolerance to drought and heat stress• Extra durable, all steel construction• Guaranteed Forever!Operating Instructions:• Water lawn thoroughly and allow to soak in.• Place foot in stirrup and step down firmly; pull straight up.• Repeat every 6" to 12" or more often in highly compacted areas.• Each new core ejects the previous one. Leave cores on top of lawn; do not rake up.• Clean out ejector tubes after final use or if tube becomes clogged.