it's for an up flow scrubber that uses the drain water from your overflow. why not take your drain line and use it to feed your up flow screen? all you would need to do is place the drain under the water line and put an elbow on it then a slotted length of pvc pipe. this should provide you with tons of flow and tons of bubbles without the use of air stones or pumps. and if you wanted the screen lit on both sides you could simply build an acrylic box above your sump and let the drain line go into the box first before overflowing into your sump. If the "overflow" on you acrylic box was high enough,then you would not have to be concerned with power out as it would always contain some water. No pump $50.00
no air stone $10.00 no added electric bill,,,,,gravity does everything. WHY is this not talked about???????