I once had a long conversation with someone who full-timed in a sprinter van, mostly all boondocking. He had some good insights into water management - he said he tries to use his water twice, like using dish water to flush the toilet, and so on.
The Pebble is an interesting concept, but I look at it as just that - an interesting concept. It wouldn’t work for me for a number of reasons, but it’s going to work for others. And in a few years they may come out with one that would be perfect for me.
I was able to go 2 weeks dry camping with 45 gallon tanks (all 3 of my tanks were 45), but that’s about it. My new trailer has 40 gallon grey and black, 45 fresh, so I’m thinking 10 days is the max. I did a little more than that once, but the last 5 days were somewhere with restrooms, which I used part of the time.
Testing your boondocking limits where you have full hookups available makes it less stressful. I wish I had done that because I always wondered how much longer I could have gone if I'd been willing to push the limits. I did once have my gray water back up into my shower but I never waited for the toilet to burp.
Linda
The owner's manual should give you the proper answer. If not, call the factory's customer service number.
I actually removed the one that came with our trailer for a time. We were installing an electrical upgrade, so many other things were replaced, too. I now have a true battery disconnect switch that is mounted very close to the batteries.