this post was submitted on 29 Oct 2025
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I'm suddenly buying a house in extreme need of repairs (including the bathroom), so I'll look into it, thanks!
https://rainstickshower.com/
Damn, that's cool.
Damn, that's expensive.
But what if you piss in the shower? Or worse ...
It goes on at length about how the myriad filters remove everything. I hadn't thought about that, but I don't think it would clean the water THAT good.
If it's reverse osmosis literally only water can pass through.
Can you imagine how much pressure the shower would have to generate to get enough flow through a single or even multiple RO filters to be able to recirculate the same shower water. It's not going to be RO, 5 micron pre-filter and some type of carbon filter. A glorified Brita shower.
I think there's two ways to do that.
Second option requires maintenance and a bunch of engineering. Unless there's a massive lack of water where you live and you have lots of money.
First option... Well, it requires more piping and that the drain pipe is a heat exchanging pipe - a pipe within a pipe where the cold water is in the outermost pipe, running in the opposite direction of the drain water. I'm not sure how much heat you would recover. The floor of the shower might need to be a bit higher than otherwise. And if you have hard water then I wouldn't do it. When you heat cold, hard water the calcium carbonate precipitates and you get limescale. To avoid reducing heat exchange efficiency and avoid clogs you would have to descale regularly and it's just not very accessible. With normal descaling you can remove a lot mechanically but here it would have to be all chemical. And how would you even get the descaler into those pipes?
Tl;dr don't do option 1, only do option 2 if you have very soft water.
A recovering water system. I can finally have a real golden shower! /s
This is very much a thing! Here's a DOE explainer page and here's a Home Depot listing
collapsed inline media
I think the usual way these are installed is they go in the basement with the drain portion going between the sewers and the house's various drains and the fresh water portion going before the water heater to pre-heat the ground-temperature water before it enters the tank (although the DOE's diagram indicates it pre-heats all fresh water entering the house, thereby also warming the cold water, which is probably great for showering, but not when getting a glass of cold water while the dishwasher or clothes washer are running)
I've thought that if I were heavily renovating or building I'd want to strongly consider putting a tankless waterheater just for the shower. Main water heater does its job but can be set to a good handwashing temp but the shower never runs out of hot and is set hot enough for both myself and my wife.