yellow water

Hi! I'm just a homeowner looking for help! Five months ago we had an HTP Phoenix 76-60 stainless steel hot water heater installed, but only about a week ago we started seeing discolored hot water (pale yellow-green) when running a bath. Cold water was clear. We have a whole house sediment filter...

We just had a new aqua sure water softener installed about a week ago. We went about 5 weeks without a softener in between the old one giving out and installation of new one. In that 5 weeks the water stained everything. The cold water would come out clear, but then turn yellow after sitting...