Fresh VS Black /Grey tank size.

[yvan]

In my bus I have a 110 gallon fresh water tank, and I have to replace the combined grey/black water tank(was an old fuel tank, and it rotted through) The current combined waste tank is only 60 gallons, and has no additional room. I can relocate the tank and lose some storage bay room. Considering the size of my fresh water tank, what sizes of grey and black should I try to fit to safely run out of fresh water without having a waste issue to deal with. Of the 110  gallons of fresh water all but about 2 gallons will go to drinking, the rest will be used for washing, bodily functions etc so I know I require at least 110 gallons. How much percentage more do I need to plan for. Also is a combined grey/black a good or bad idea and why?
 

[eXodus]

Normal Factory designed holding systems  are about 20 - 35% bigger then the fresh water tank.  So for you 132 Gallons or more.


You shouldn't get your Black together with gray. You probably won't get the solids out of such a huge tank.

[DonD]

My current rig is 40 gal fresh, 50 total used=30grey, 20 blk.

[M & J]

Our Allegro has 40 gallons fresh, 30 gallons black, 30 gallons gray.

[DaveVA78Chieftain]

60 fresh
55 Black
17 Grey (way too small)

Dave

[Rickf1985]

That sounds way out of proportion.

[eXodus]

55 Fresh.

I've got two gray water tanks, one black water and this is a total of 67 Gallons.
but I've got no idea which tank has what size. Seems like the Bathroom sink has it's own gray water tank.

After 4 days of camping the Black showed full and one of the Gray tanks. The other gray was not half full, and we still got fresh water left.

[eXodus]

Probably my black tank sensors are not that good. They show full after 4 days but I can see on the outside that there is still room.


After going 8 days, tank is still not full.