Large above ground pool - approx 5m diameter - it's the style shown in the screenshot.
It's been sitting in the shed for a few years but was fine last time I put it up.
There are a couple of boxes of hoses, fittings, and other filtration/pump bits and pieces - not sure exactly what is there but likely to be most of what you need but may need a few replacement bits from a pool shop or bunnings.
Pickup in Spotswood