<a href=showthread.php?s=&postid=9492313#post9492313 target=_blank>Originally posted</a> by Duddly01
It is a JBJ ATO system. a little float sensor turns on when it hits its bottom point and turns back off when it reaches its top point. Seems to keep the level in the sump to within 1/2" at all times. Not the best ATO, but seems to work great so far. That alarm is a bit annoying though.