pump
Install a shower pump without a sump and float. On my boat, the shower drains into the bilge. I just attached another hose to the end of that line that goes to a shower pump, that pumps into the sink drain. The switch is in the shower. No more wet bilge. I wanted as little stagnant water as possible, that's why I opted not to go with a sump system, besides, this pump will handle hair, soap, etc. Defender has the pump for about $150, bilge hose, and push/pull switch ($15). Home Depot provided the sink elbow with the dishwasher branch (where I plumbed in the pump outflow).If you're interested, I'll take some pics for you.