H2H1;80985 said:are you sating your fresh water tank is 140 gallons, wow that is large. I use 1/4 cup of bleach per gallon of water. I did drive it around to get all the tank soaked or at least wet. After that I let it sit for 24 hours or a little more and then drain and flush. I have been doing this for several years and so for so good. I am sure others have there way, but that is mine. good luck
akjimny;81020 said:Richie - I use sodium di-chlor (pool shock), a dry chemical you can get a Walmart, Home Depot or any pool supply store. You only need a tablespoon for a 40 gallon water tank. I put it in the faucet end of my water hose, then fill my fresh water tank like usual. This sanitizes both the hose and the tank. When the tank is full, I turn on the pump and run each faucet, starting at the one furthest away from the tank. I run the pump until the tank is as empty as it will get it. After turning off the pump, I open the tank drain valve and take the annode out of the hot water tank to allow it to drain.
Close the drain valve, put the annode back in and fill the tank. You're ready to go. Sodium di-chlor doesn't leave a chlorine taste in the water like bleach does and sanitizes just as well, in my opinion. Hope this helps some. Post back if you have more questions.