I need one of these for the RSR 250 V3 Sump, the dual sock chamber. The other difference here is that the intake and sock chambers both have the same level dam spill way which will both have to be raised to properly flood the sock area to trigger the Klir optical sensor. The other thought here is to connect the Klir to the Apex and program it to come on frequently enough to rotate the fleece roller. If that is possible it also has pros and cons.