That actually sounds about right. I have a real good salinity tester (YSI Pro) and my water softener puts about 250-300 PPM into the water. OTOH if you buy an Reverse Osmosis that will come down to way less than 100. I seem to be around 65-75 PPM out of my Whirlpool R/O starting with water that is 750-800 PPM. (I get ~500 PPM out of my well). If you are more like 250 PPM it should be a lot better. There are better R/Os too.