black tank blocked

when in Yuma last winter I learned a lesson and boy I don't want to do that again. I went out to empty the back tank and pulled the handle. every thing was going fine until DW called me to tell me something and BANG a senior moment. I forgot the close the valve on the black tank. a week later I again went out to empty and the handle was in the out position. I knew I had screwed up. luckily I was at a lot in Yuma that had other facilities and I went to the RV dealer in Fortuna and got a bottle of black tank digestor. poured that in and waited a few days and put as much water in as I could and pulled the handle. clean as a whistle. lesson learned, do not leave the area until the black tank is empty and cleaned then close the valve. I still counting my blessings on that one.