Good day Ray. I'd say if your lawn is not overly compacted run it once. If
there is a good deal of compaction or your lawn is heavy clay run it
twice. After your done you may wish to spread sand over the lawn to fill
in the holes. If you have heavy clay, do not do this or you'll make
concrete. I personally preferr finely ground compost as a top dressing.
Top dressing is not required though.
Have fun aerating.
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