Water pipeline for water backfeeding and irrigation

The question has probably already been answered by Graf. In order to use the other filters, the outlet and rainwater inflow would have to be at different heights. Since this is not the case, I will probably have to stick with what I have.

There are different versions. Based on your description or my understanding, the Minimax-Pro filter should fit internally. But as I said, you have to check the various filters with Graf. Even a finer filter without backflushing would already help a lot. There is also a "tool" to make it easier to remove the filter in deep shafts.