re hygiene. make provision for a lid for your sandpit when it is not in use and use it.
Within minutes of you filling it with sand you can be sure that every cat for miles around will know about the new public toilet that ( in their opinion ) has been specially built for them. Unless you have dogs patrolling the boundaries 24x7x52 I can guarantee that there will be a cat waiting to christen the sand at the first opportunity :eek: