[Bamabox]

I did the same thing. Forgot the black tank flush line. I use the water pump to do all the other lines with the diverter kit and anti freeze. So I say to the DW, all done. Doh!!!! Used the hand pump to do the black tank line and opened the black tank valve. Waited to see pink. Only took about a quart. Having said that, the previous 2 winters I know I did nothing to it, and no issues, so maybe it’s a non issue. We typically see 10 below at least once.