I'm installing holding tanks
on my Bavaria
49 as a requirement for sailing in the Puget Sound
will be gravity drained, mounted above the waterline. There will be a 1 1/2 inch through hull
mounted right below the tank for when I want to drain it into the sea. I also need to have the option to pump it out through a deck
So, I'm having the tanks custom made, and I have the option of having them put in a drain tube from the top or a hole in the bottom. If I put the pump drain hole in the bottom, right next to the other drain hole, the hose would then run from the bottom of the tank up to the deck
fitting above the tank. Or I could have them put a hole in the top of the tank with a tube going to the bottom and the hose would have a short run from the top of the tank to the deck fitting above.
What are the things I should consider with making this decision, other than saving money
on extra lengths of hose? Is the tube a better way to pump out?