I would try to use r/o if at all posible, get it from a fish store, buy a unit online or where I live there are 3 companys that sell units culligan, planet earth and the filter guys all sell much cheaper then the units with the fish pictures on them and they will replace filters test your water and take care of the units you can rent from them. I have a kent maxima 4stage 50gpd unit it produces 2 gal
an hour, I have no idea about the waste its plumbed into the house, but every time its time to replace filters I regret not checking into the other options. They are worth having, fetching 40gallons a month from the lfs
is a workout and hassle that gets old fast. I got mine to get rid of algae, slime and hair that went away and never came back after battling them for a few years with the tap water.