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Like already mentioned, you can't rely on the sensors too much. They very seldom work accurately. After camping for a few times you will learn how long you can go before dumping. My tanks are 32 gallons each. With two people camping I empty my grey tank every2-3 days. The black tank will go at least a week. Possibly longer but after 7 days I empty to keep it from smelling. If the grey tank is full you will notice the tub not draining. Not sure how your black tank is but mine is below the toilet so I can shine a flashlight down my toilet and see the level. Not the most pleasant way but you definitely don't want a black tank over filling. Hope this helps.
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