Decided to offer aeration this year. Does anyone have a damage waiver/contract that you would be willing to post. I assume it would over sprinkler system, underground electric dog fence, cable wires,etc. Any type of yard I need to run from that will cause damage problems such as underground dog fence. I will rent an aerator this year and it appears the only thing available around here is BlueBird. Any hints best way to operate them such as need two passes per yard or go sideways on the hill. Any other hints to prepare customer for aeration such as giving them flags to mark sprinkler heads, etc. Any comments would be helpful.