water softener or reverse osmosis ?
#2
You need a water softener to remove the calcium and magnesium (if any) from your water to make it 'soft'.
Then if you want, you can add an RO system. If you do an RO system without the water softener, the RO membrane plugs very quickly, which is costly.
Then if you want, you can add an RO system. If you do an RO system without the water softener, the RO membrane plugs very quickly, which is costly.