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Im not a full timer but we use our outback frequently (15->20 trips a year), I use the water softener and put some of the liquid tst in the tank from time to time to keep odors down. However I dont always do it, just during long trips (longer than 5 days) and about once every month that were using the trailer (Feb-->Nov).
HOWEVER, when I put the trailer to bed in the winter I use three of the packets and put them in my black tank after filling it about half full. I also add some antifreeze to keep things slushy if things get that cold but usually dont. I think this helps keep the tank clean and the smells down once spring arrives.
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