1/4 cup of bleach for every 15 gals of water.
If your stated water capacity is 36 gals, that usually means you have a 30 gal. fressh water tank and 6 gal. water heater. If that is the case, 1/2 cup of bleach mixed in a gallon milk jug poured into a partially filled tank, then continue to fill the tank. If you choose to sanitize the water heater, then the concentration would be correct pumping from the fresh water tank.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263