My Factory fresh water tank has a drain in the line leading off from it. It's a tiny valve you pull up on and the water drains down below.
When I drain my fresh water I just drain it by pumping it out to a sink. Leave the faucet on. Make sure you flush it out really good.
But my tank hasn't ever gotten 'smelly'.
I might have to take the tank right out if that happened.
I placed a couple extra large tanks in the storage that I use for drinking. I take those out once a year and clean them good. Have a separate faucet for them.
Gotta take your drinking water seriously.
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