I don't know if it's available in your area but I use a
Hydrologic Evolution RO 1000. My tap water is 450-500ppm going in and 0ppm coming out (x500 scale). I get 40-50 gallons of RO per hour depending on the input temp.
Using a higher capacity unit like this eliminates the need for an RO tank and such that comes with using a smaller unit. Just this device on a shelf in my laundry room. It's also more expensive, though. I paid about $620 for mine not including the ball valves, float valves, tees, couplers, tubing, and elbows.
It's nice having that much RO always on demand. I have a float valve set up to my humidifier and reservoirs so the humidifier is always full and filling the res is opening the ball valve, wait a little bit, shut the ball valve. No worrying about overflowing. I also have a good bit of tubing I use as an auxiliary hose for washing gear and running hash.
All that said, RO might not be necessary. Maybe just an in-line filter. I like having RO but many people do just fine with tap or softened water. When I was doing soil I was using this same 450ppm water just ran through a carbon filter similar to
this one and did just fine.
Are you able to get a water report for your area?