Thanks for taking the time to respond. Yes, when I experimented by running the tubes over the side of the tub an running the pump there is no water movement. It seems like in theory I could do some gymnastics and prime the pump and tubes in a way to get enough suction to get the system to work, but what happens when the pump shuts off, water drains out, and then restarts.

It is a 1000gph pump, so it should be more than enough, I just don't know how to get it to suck water over the edge of the tub rather than through the side below water level.

I am assuming there is no flow. A few things to address here. First, you should probably circulate solution 3 full times each day or after each float. most tanks are about 200 gallons so this is 600 gallons divided by the flow. Standard float tank pumps are about 35gpm so this can be acheived in about 20 mins. Calculate for less flow. One problem that needs to be cosidered is skimming. Most things float, so it is best to have a skimmer which can be acheived fairly simply if you have a strong enough pump.