Our Manual Lawn Coring Aerator reduces soil compaction, water run-off and puddling. Lets air, water and fertilizer get down to the roots. Your lawn will look better with less water and fertilizer. Breaks down thatch and promotes vigorous root growth, strengthening tolerance to drought and heat stress. For best results water your yard thoroughly before aerating. Professionals recommend aeration in both spring and fall, depending on the type of grass, but aeration is good for lawns anytime. Extra durable, all steel construction. Yard Butler guarantees all Yard Butler tools for life against any defects in manufacturing or materials.