Aeration is a necessity for your lawn. Aeration is when you pull out 1/2 inch by 3 inch plugs of dirt out of your lawn. This helps water and nutrients go down to the very bottom of the roots. We recommend having this done is the spring and fall. After this is done we recommend having your lawn fertilized, this adds nutrients the the very bottom roots.
Note, We highly recommend you to mark your sprinklers before aeration.