Our previous 41 foot DP had the shower, 2nd bathroom sink & Kitchen sink on the passenger side, the main bathroom sink & toilet on the drivers side. Only the toilet drained into the black tank, the shower and all sinks into the grey. In our current Gemini, the shower (drivers side) and the kitchen sink, (toward the front & on the passenger side, both go into the grey tank, the bathroom sink (right next to the shower) and the toilet go into the black tank. Like I said before, I understand the need for water in the black tank, have managed waste tanks for years with no problems, don't need or want the manufactures help, but there it is anyway, with that ^%%$# bathroom sink going into the black tank. Guess we will start brushing our teeth in the kitchen.
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