It is expensive, and if you don't have a large yard, the cost goes way up as you need to install a vertical system instead of a horizontal one. Tree roots mess

It is expensive, and if you don't have a large yard, the cost goes way up as you need to install a vertical system instead of a horizontal one. Tree roots mess with the piping, and you have to be careful to not drive or set anything over it (much like a septic drain field, though not as fragile).