Water pipeline for water backfeeding and irrigation

Ok. Usually, it's not the case that everything is always on or open all the time.

Can I increase the pressure via a separation station? The landscape gardener had once mentioned something like that if the pressure is too low.

Not via the system separator but via a pressure boosting station. Should not be necessary at 3.5 bar.

How great is the comfort gain from the automatic refilling? Otherwise, is the garden hose constantly lying in the pool for refilling?

Otherwise, you constantly have to check the water level, refill after flushing, etc. The hose is always lying around. I would never build it without automatic refilling.

Just tested the line. At 3.5 bar, I’m only getting just under 0.6 m3/h out. That’s really low, isn’t it?

At the outdoor faucet? Usually, a thin pipe is used there... In the basement, you can branch off directly from the main line. The refill doesn’t have to balance out in just a few minutes.