bukhrn wrote:
25 gal. is pretty small, mine is 35 & we have to be conservative on usage, those that are showering every night, obviously have a MUCH bigger tank ...
We have a 30 gal fresh water tank and
do shower each night ... the trick isn't tank size but having a means to retrieve more fresh water as you need it and get into the trailer's tank. For me, that's a set of fresh water Aquatainers and a 12 vdc pump to effortlessly transfer the water from the 'Tainers to the trailer. We haven't seen a campground shower house in years. :B
... but remember, what ever your capacity is, you also have to have enough waste tank capacity, to store all that water, unless you're in a state that allows you to dump your grey water on the ground, Not all states do.
Again, it's not necessary to have large tanks and in the case of grey water one only needs the means to easily off load it for later disposal. It's also not necessary to completely empty the GW tank, only off load enough that the system becomes usable again. Rather than use a heavy, expensive wheeled tote tank that's a pain to deal with, a pain to store, I instead use a couple of Aquatainers labeled for the purpose. For grey water gravity feed works just fine ...

... but because I have a FloJet Waste Macerator I can also use those same GW Aquatainers for off loading macerated black water with no effort at all. Whether we're talking fresh water, grey water, or black water it's
not tank size that's the limiting factor but not having the means to retrieve more fresh water and efficiently off load grey & black.