I think in Qld the new laws that have come in mean that all pools need to be fenced, even above ground ones that previously did not need fencing due to their high walls (like the container pools). They're super strict now with the deadline for compliance being the end of this year.
We had one of the portable pools from Clark Rubber and it was up for 5 weeks over summer. It was great fun, and we had no trouble keeping it clean and balanced. But then we discovered that it had to be fenced, and that even if you put temporary fencing up you had to get it inspected and registered under the new laws. And the cost of fencing and getting it inspected etc would have been more than the pool cost so we took it down.