New to TT - sewer question or lack there of

We purchased a 27 gallon tote. It does get heavy, so monitor your grey tank. When it gets to half full, I would dump it into your tote. We fortunately have a teenage boy that loves flexing his muscles. We (we have been camping with 2 other families. 15 total campers) create an outdoor washing station. Use a blue tote full of water with paper towels and soap outside to wash hands. You two tubs outside to wash dishes. One is your soapy water. Use your outside shower to get hot water in both bins. With three of us in the camper, the shower normally fills to 2/3 full in one day. We aren't taking Navy showers. The two men use the campground facilities for bathroom visits, momma uses the trailer. Like others said, the black tank usually isn't the problem.