Black Tank Flush 2025 Adventurer 35F

[Little Beau]

We have a 2025 Adventurer 35f when we empty the Black tanks what is the proper procedure? The manual says do the half bath first but it was hard understanding the owners manual. How do the owners of the 35f empty their black tanks? Thanks in advance

 

[klook]

How many Black tanks do you have? Dump them both at the same time and follow with the gray tank(s) to clean the line.....

 

[Road Warrior-CB]

I have a 2023 Adventurer 35F and my 2nd bathroom has a macerator switch in the wet bay. First, ensure the sewage hose is securely set into the sewage hole (it is a good idea to put something heavy over it to hold it down to avoid a mess) then pull the gate valve on the passenger side compartment first, then go back to the wet bay and pull the gate valve for the 2nd bathroom and hold the macerator switch and you will see the sludge come out. Once there is no more, shut off the macerator, close both gate valves and open the main bathroom gate valve until drained.

 

[Morich]

I like pictures as they can show me details!
Your overall drain system and these pictures are snips from this parts info:

Winnebago Cortona Portal

cortona.winnebago.com

At the small tank, when you want to drain it?

You need to open this valve to let waste go to pump Before starting pump as running dry is not good for pump! Open this valve before or after opening valve at large tank would seem to make no difference? At some point both need to be open before turning pump on! No big deal if pump is on first but it can't move much with either valve closed!

Open small valve at main tank, some may move gravity flow but turn on pump to move the rest?
I would do this , get all waste from small out and rinse if doing that, then turn off pump, close both valves and be done with the small tank. Nothing says both have to be drained at same time but I tend to do both whie at the job?
then after that question is out of the way, I do the larger tanks, black first and grey second. Theory says grey last to flush but in your case there is not a lot of black to flush except in the drain hose.
Two small valves and pump to drain small. one large handle on each black and grey main tanks to drain them. Close all when done??? Don't run pump long when totally dry to avoid wear on it!