There are some state variations but generally:
Pool fencing must be 1.2 metres in height, and not made to be climbed.
Any gaps, under the fence or between parts of the formation, must be no greater than 100mm.
There should be nothing around the fence that allows an individual to climb the fence.
Gates should open outward from the pool and automatically close and self-latch.
Direct access from a house is not permitted; the house must be separated by a fence.
The self-latching gate in the fence must have the latching mechanism 1.5 meters above the ground, or be fitted with a shield. Children should not be able to open the gate from the outside.
Spas must also be fenced in some Australian states.