Last Fall, I had a mobile company winterize the water system in my TT. He put the non-tox into the fresh water tank and used the pump to circulate it through the faucets, toilet, etc. I am seeing posts in the stickys posted in other forums here that recommend not doing that. I never use the fresh water tank, as we are on a perm site and use the city water. Is there any reason I should not just do as he did?