The indicator lights on tanks are always questionable. With it showing 2/3's full after emptying, I would suspect that the level sensor is malfunctioning (either dirty or ?). With the tank filling with two showers, either the tank is not completely emptying or you are just using too much water. As many have said, showers need to be taken the old military way (get wet, turn off, soap up, rinse and turn off again). I have a 36 gallon gray water tank and I can run about 5 days with just myself and taking showers daily plus dish washing etc. Hope this gives you a bit of direction
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