Fresh water system!!!
Our pool builder installed a Barramundi Fresh water system, (In Australia, i'm not sure under what brands it's sold overseas), but basically it uses titanium electrolysis to oxidise everything to keep the water clean, and adds very small amounts of copper (through electrolysis automatically) as an added algae preventative measure.
It's great because the water isn't salty and doesn't smell of chlorine, save on maintenance costs...it's just like swimming in bottled water lol so when u inevitably swallow a mouthfull of water, it's just like tap water. Of course you still need to add calcium if its a concrete pool, buffer and pH adjusters but u don't notice these at all. Having previously maintained a salt-water pool in another house, which was previously chlorine this is by far the best to swim in and maintain.
Make sure you know exactly how much dumping fees will cost, we didn't ask and they're generally not included in the quote because it depends on whether the fill is "clean" i.e rock, we added an extra $20 000 in dumping fees alone, so make sure you ask!!!
Oh and if you get a free form shaped pool, solar covers reallly don't work, we discovered this on ours after paying $1800 to satisfy government water regulations, it is too hard to get out due to having a skinny section in the middle. There are liquid covers available, based on silicon which spread across the water...i'm wishing we purchased one of these instead (although the liquid is VERY expensive.
Finally if you're installing solar, go for a modular panel system over the horrible black rubber draping your entire roof, its much more space efficient and works better on windy/cooler days than the rubber, however it is substantially more expensive.
My pool (2 months old) 12.5x5.0m Concrete-fully tiled Freeform pool, barramundi freshwater system, waterco cartridge filter,