ok, odd thing;

we're running a sand filter, a 5 micron filter, a UV light and on to a charcoal filter before it goes into the house.

I noticed that we had a sulfer smell but it was only in the hot water side. So I flushed the hot water tank for about an hour and it was all gone and was fine for about a week, then the odor started coming back, but hot water side only. I do have to say that we haven't moved into the house yet so we're not running much water through the system but want to get to the bottom of it.

Any ideas?