Step 5 · Open Drain Valve and Drain Tank
Using channel-lock pliers or a flathead screwdriver (depending on the valve type), carefully turn the drain valve handle or slot counter-clockwise to open it. Water will begin to flow through the hose. The initial flow may be slow if sediment is already blocking the valve opening. Allow the tank to drain completely. This can take anywhere from 15 to 45 minutes depending on the size of your tank.