olivierdu33 wrote:As you will see....I am not a designer....but hope that this will be enough to understand.
In my opinion, this cannot work properly as you plan. As soon as the "steel" tank is full, the water level will rise in the pipes in 40 and I do not think that a pipe with a diameter of 20 (and 20m long) can evacuate the flow of a shower with very little water height. In short, it's not just going to be a shower, but also a foot bath, it's not going to drain!