I have a new deep water well and there is a dirty metalic smell in the water. You do not smell it at first. After the water has run a couple of minutes then can smell it. You can smell it even in the freshly washed clothes. All of the water tests came out safe. I let the tap drip alittle and also noticed a slimey brownish yellow stain that runs from the tap to the drain. Your thoughts on what it might be. I know it is not sulfer I do know what that smells and tastes like. Your thoughts? Thank you