Bob,
When you say the sink doesn't drain completely does the water remain in the sink or does the macerator remove the water and then when turned off the water comes back into the sink?
The reason I ask is there should be a one-way valve in the drain line and if it doesn't completely seal when the pump is off it may allow water from the drain line to back into the sink.
On my Challenger when I drain the outdoor sink I might have a few tablespoons of water remaining but that is because of the way the drain pipe flange is mounted to the bottom of the sink.
__________________
Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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