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Very nicely done; in design, implementation, and vid showing the steps. Succinct and complete for anyone with even a modicum of skills. Big kudos.
I had a free-standing shower tent for a while (with changing/potty room and shower room with vented flat floor to keep one's feet out of resulting wetness). Worked fabulously, especially when off-grid. Though when off-grid I found I did not need the privacy as much, so rarely used it. I eventually sold it and the single room shower tent I had.
When I was using it, though, I was told once by a Ranger at a popular US national park campground that they did not allow any on-site water run-off from campers, especially if it had soap in it.
Easy to think "Oh just this once won't matter!" Though when even one in a hundred think that, it still means thousands throughout a year in popular recreation areas. And hundreds of thousands year after year. That is a lot of potentially harmful soapy runoff.
I contemplated using the deep lid from my camp kitchen (meant to come off for washing dishes, etc and deep/large enough to wash a dog) for standing in, and then dumping it in the RV waste drains. Pain to collect and dispose of properly.
In the end, I started using other methods to self-clean when in congregated areas.
When off-grid, I use as simple a bio-degradable soap as I can find for showering. I make sure when I wash I am as far from surface water as I can be (recommended is 200' - more in some literature). Even better proved to be using bird-bath methods at my sink (uses far less water and when I'm off-grid for weeks, amounts matter) and then dumping that into the DIY sump drains I'd make when off-grid for basecamp stays. Easily made: reasonably deep hole filled with available graduated aggregate. Again, a good ways away from surface water sources.
Commercial and household soaps in runoff water--especially from many visitors throughout the year when concentrated in popular recreation areas, whether nat'l, state parks, or NF or WMA areas or not--can seriously alter the biome and nature of an environment. Changes the PH dramatically. Bio-degradable does not mean not harmful to the environment.
Not saying you don't heed these rules, at all, though for the readers of this thread, it pays off in the long run and protects our wilderness areas to pay attention to where we let our waste water drain.
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