I have a 2005 Lagoon 410, owners version with two heads (one on each side). Does anyone know the holding tank volumes for these tanks?
Any ideas on how to estimate when they are getting near full?
They're about 15 gallons each. If you listen you can hear the waste fall into the tank as you pump. As the tank fills the sound changes. In any case on the fourth day it's time to pump out. We live aboard full time.
You'll know when they're full when the waste comes out the vent!