I would let Hubby win this one.......
Then when he is dealing with sewer flies, clogged drain lines and the poop pyramid you can stand there and honestly state "I TOLD YOU SO!"
Let him win...it'll be a good time and a great learning experience.
Just have him visualize these 2 scenes
A high fast flowing river moving boulders (full tank when dumping)
Or
A low slow trickle in a creek that can't even budge a pebble (dump valve left open and all liquids dribble out as they come in)
Nevermind......let him win :B