Auto empty system.

Hi all,

I have a pump running in my sump socket number 5. This pump is to empty 60l of water a time when I need to do a water change. I have marked my sump when my system is of and when I toke out 60L of water out. So I have a max and a min. So what I want is in auto water change that socket 5, 6 and 7 stop. Than after when my sump come to max level the pomp has to start pumping until he reach min level.

This pump is a pump as well for my uv and chiller circulation so when water change is done it has to go in normal again this is socket number 5

I have two level sensors as well.

Any advise how to set this one up