Horrendous smell and pink water coming out of FW tank

Use 1/4 cup for every 15 gallons of water capacity, including the capacity of the water heater. Pour it into the freshwater hose, put the hose ends together and slosh it around. Then connect the hose to the rv, and fill the tank full. Open all the faucets, including the hot sides, and let the water run until you smell bleach coming out. Then let it stand like that for 12-24 hours.

Drain the tank, fill with fresh water, run it until the bleach smell is gone. Repeat the drain and fill a couple of times.