If I lived in ****ney again, or gold coast, Adelaide, perth, alice springs I'd still do it.
There is no doubt they are an expensive toy to own and maintain but I do love our pool. Thankfully our climate is perfect for pools with us using the pool for about 8.5 - 9 months of the year. I know when we lived in Sydney I would only venture in to the pool for about 4 months of the year.
A normal balanced salt water pool should only need 7-8 hours cycle during the summer months and possibly get away with 5-6 hours in the off season. You would need to constantly check it to work out what the minimum running time per day is. As soon as you need to buy more chemicals than you were better off just letting the pool run for extra time.
Overdosing with salt may produce a little more chlorine but you would need a fair amount of extra salt and would need to increase the amps on the chlorinator. The cost of extra salt and power would probably cost more than just running the system for a couple more hours per day plus the extra salt may make the pool unpleasant to swim in.
There are much more economical electric pumps available now. We have one and we also run our pool on Tariff 33 which has reduced our running costs.
I have just had our pool tested, I needed to add salt only. The last time we added chemicals was in May. The pool will run for 8 hours a day and I won't need to add any salt or chemicals now until we receive massive rains in Dec or Jan.
Another tip, if I have a lot of extra people or extra kids in the pool I run the pool pump the entire time they are in the pool. You will need to use an extension chord if you have tariff 33. Lots of people using the pool drops skin, pee, hair, makeup, sunscreen etc that unbalances the ph level in the pool. By running the pool during high use, the pool doesn't need to work as hard to catch up when it is due to cycle again.