I ordered my pump today, went for a Hozelock Cascade 4000 Submersible Pond Pump. Just got to wait for it to be posted now.

Buried the conduit last weekend and set up an old space case for the back-up battery, air pump and power points. Also added the drain piping to the bath tubs, another trip to Bunnings is in order for some more bits and pieces.

Hopefully it'll be at cycling stage in a couple of weeks.