Your budget and the type of pool you have will determine which pool cleaner you should buy. In some cases, the debris may be so large that a suction cleaner may not be the correct pool cleaner for you. In other cases, the debris may be so fine that a robotic cleaner may not pick up all the fine debris a suction cleaner would otherwise capture.
Bunnings has a large range of pool cleaners with the more popular being the Hy-Clor Swift and Pulse.