The Defense Acquisition University Alumni Association (DAUAA) is an alumni organization for the Defense Acquisition University. It was founded in 2002 and is still very active today.
Fill your fresh water tank again with cold water and let the water sit in the tank for about 8 to 12 hours. After the allotted time, turn on all the faucets and water outlets in your RV again and let the water run until the smell of the bleach goes away.
The small valve is for the gray water tank and the large valve is for the black water tank. One golden rule for RV holding tanks is to never dump the black water tank until it is at least two thirds full. You want the tank nearly full so the weight and the gravity will force the contents of the tank to drain properly.