Re: How big a holding tank vs. camping
When coastal just 2 of us using fresh is never an issue. When no access to fresh for awhile plan ahead and use salt. Think given to date that's not a long time and in that setting no issue using a lot of flush with nothing going to holding tanks build up should be minimal. Also flip back to fresh as soon as we can. Nice feature having the choice. Not hard to do and would suggest it even as a retrofit when your existing system needs a major rebuild. Mistake we made is having all fresh go through a whole boat filtration system. No need to having water going to the heads filtered.