They keep moving back the delivery. I gave up and am building my own from PVC sheet and controlling a much more powerful motor with a cnc controller which will give me umlimited ability to program agitation. It will accept my lifts amd there will be a dual heater system, a pig warmer underneath the whole unit and a submersible heater in the reservoir. I have an easily obtainable/replaceable inexpensive aquarium pump which will move more water than the Jobo pump..About $600.00 finished for the whole unit..