Tenant pool installation request - Insurance Concerns?

[Jacob Hilton]

I only have one rental so I am just getting into this.  The tenant has been great so far and paying on time.  However, I was just asked if they could put an above ground pool in the backyard.  Assuming it is not permanent (not fixed in any way) and understanding it will likely kill the grass, would should there be any other concerns to think of? Potential insurance or liability concerns?