Black stuff in home water supply.
This black oily or paraffin type stuff sometimes comes through my hot water line in the second story. Have talked to the water company. They say it isn't them or their water, it's in the house. I know about anode rods, yes. I have drained the water heater, yes. I have replaced the electric water heater (a few years back) but it did it after I replaced the heater as it did before I replaced it. Current heater is 6 yrs. old. I have not changed the rods. I have looked everywhere I can to see if a previous owner spliced in some rubber hose but see none and it would have rotted through by now. A plumber said it is phosphates that collect in hot water and can not collect on a worn anode rod. But I have drained and replaced as I said. This has been going on for years. At a minimum I would like to get it analyzed just to see what it is. If I change the water heater as I did before I fear it will just come back in a short time. Ideas or advice on this? How often do you have to drain a hot water tank, do people really change anode rods? How often should you replace your hot water heater. I always did it when they went out. I never drained one and never changed rods, because I NEVER experienced this before and I have lived in a lot of different homes and apts.