200 ppm seems a little high to me. My tap comes out at 20-30 ppm. I still opted for a two phase filter, one if a 5 micron prefilter and one is a catalyzed carbon filter designed to greatly reduce chloramine (not chlorine).
Chloramine is chlorine bonded with amonia and that is what is in my water. I still add cal/mag as micronutrients are essential to good plant growth