Why aerate?
(Figure A) Over time a normal lawn will compact itself. A compact ground not only tends to cause thatch build up but also greatly reduces the amount of air and nutrients that enter the ground. With less nutrients to feed on and a harder ground to break into, grass roots can't grow and often the grass itself turns into an ugly brownish-yellow color ultimately provoking thinning of the grass .

When to aerate.
Experts agree that aeration should be done one, possibly two, times per year. The spring and fall seasons are probably the best times to aerate your lawn.

Overseeding.
If your turf is still in fairly good shape, you may choose to overseed it.
Overseeding is the process with which you thicken the existing turf with new seeds. Overseeding is particularly effective after aeration or dethatching because the cleaned or aerated soil is now ready to accept the growth of the new seeds.

The Befco Green-Rite; the one pass aerator/overseeder!
The Befco Green-Rite was specifically designed to make aeration and overseeding easy, fast and most of all, effective. When the Green-rite is equipped with the aerator rotor, the user can aerate and overseed the lawn in one pass.
If your lawn requires more than an overseeding, the Befco Green-rite may be equipped with a tiller rotor. This will allow the user not only to prepare the soil (as he would do with a normal tiller) but also to seed it in a single pass.