I don't look at the gauge.
To charge, I add water, stopping periodically to push the flush switch. When water starts to circulate I stop adding water.
When I an see fluid through the opening, it is time to dump. Sometimes i will pull the dump valve handle on the Thetford, allowing some of the waste to fill the drain pipe. This adds a little to the capacity.
we almost exclusively dry camp. For me it is critical to manage the Thetford. We have three adult women and two adult men. For four days I need a Blu-Tote with me.
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