Hi everyone, I purchased a used RS Max 500, so far everything is working great since the big move last Saturday. I am just now getting the ATO setup, the float valve in the back, that's for the ato, correct? Which sump tank level line should I aim for when pumps are on? Between the 2 that are close together? The seller had one of those level meters/alarm setup, it seems a bit difficult to work with....any recommendations?