I have just remodeled and added another bathroom, I added a whirlpool tub, and upgraded to a 80 gallon hot water heater. Now there is a smell to the hot water and after the whirlpool comes on there is a black grit that forms around the tub we also have a well, I have tried a whole house filter without any success needs help

It sounds like some minerals have leeched into your water and have interacted with the magnesium anode rod in your water heater creating hydrogen sulfate gas. The rod is located under the large looking nut on top of your heater. First try flushing out your heater. Attach a hose on the boiler drain located at the bottom of the heater. With the pressure left on open the hose bib and let the water run until it's clear. If the problem persists, change the anode rod to aluminum. Now check the screens on your aerators. If they are silted up clean them. Remember how you took them apart. If the shower has a single lever valve pull the cartridge and check the cold water ports for trash or silt in them. I'm betting the smell is worse from the hot water. If that's so the heater is at fault. Good luck and thank you for rating my answer. Tom