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This depends a bit on how you use your rig.. When I first got my rig we summered in it and come winter parked it on our back lot and ... Well it still got used most every day but only for an hour or so.
As weather warmed we put water in it and dropped some product in the black tank, and for a few months.. That's about all.
Then as summer finally hit we dumped whatever was in the tank and went camping.
NOW: We full time, and do not use any "Tank" product,, Just water.
I find Gray generally stinks worse than black, and since I've done a few rebuilds recently on my toilet (Where I have to pull it off to replace a broken shaft and then modify the new shaft) and have one more rebuild to do (Once I can afford "Official" replacement parts) I have stuck my nose over the open pipe for quite a bit of time in the last month..
I'm very happy with the water solution on the black.
What I wish.. Is that I had a way to rinse the gray. But alas, till I can afford it, I don't.
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Home is where I park it!
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