Which hose (material) for cistern?

Hello everyone, Our rainwater cistern is to be connected to a water pipe inside the house with a hose that will be laid through the [Mehrspartenhauseinführung]. A Grundfos pump will be running in the cistern to pump the water. What kind of hose is recommended for this? Are there materials that are particularly suitable or ones that are completely unsuitable? Are there special products for this? I would appreciate tips and experiences.

Use PE-HD pipe. Use the diameter of your pump connection. Do you want to use the water for the toilet and such? Think about filters, etc. Better to use the water for irrigation. The double lines, filtering, switching options with necessary separation are quite complex. You won't really "save" much there for a long time...

Hello Rick A pipe I will not be able to get through the house entry. It must be a hose. A line inside the house will be connected, which leads outside again at another point. Inside there is a water tap, e.g. for watering.

The pipe is flexible within certain limits. With some lubricant and a hot air gun, it becomes easier. You should easily get a DN25 through a [Durchführung]. What kind of [Durchführung] do you have or how big is it? I can only advise against using a hose. That will cause problems in the long run.