The bladder is an interesting idea. Can you explain how you use it?
If you place it on the ground and drain into it how do you get it into your truck to empty it?
If you put it into the truck first how do you get your waste water into it? Macerator pump?
I first found this video:
Revolutionizing Boondocking RV Life: Our Game-Changing Black Tank Tote Solution
And then their follow-up:
Revolutionizing Boondocking RV Life: Our IMPROVED Controversial Black Tank Tote System
Our setup is mostly like there's but I used a hub valterra bayonet adapter instead of threaded to go into the fernco.
To summarize though - I lay out the bladder in the bed of the truck and use a macerator pump to pump the black tanks and both grays into it, drive to the dump station, hook up regular sewer hose and open the valve. Flush it from the top as normal and then fold it back up, tuck it to the side of the hitch, and fill our 55gal drum of water at the nearest potable source. I will grab a blue 143gal bladder for water next time they go on sale on amazon though. Now that we can haul this much waste water in one go, water has become our constraint at 55gal a run. Since I already have the drum with us, I will be able to fill the 98gal water tank on board, and pump the excess 45gal into the drum for on-site reserve.
I have recently, and rather unfortunately learned that after a few weeks of this method, without the velocity of a fully open sewer line during a normal dumping situation, the black tank cannot expel the solids very well since the "flow" has to sit against the macerator and is pumped according to the pump rate. I am now fighting the dreaded pyramid in the main black tank. I plan to open the black tank gate valve, let it flow to pump, close it, pump the contents, then open again to have a gravity runway, close, pump, repeat, until empty. Trying to allow the velocity of the initial flow to bring solids with it instead of leave them behind in the tank. These are the details I don't get to explain to my wife. So thank you.. ha!
