I forgot about the uniseals. Put them on a yearly replacement list... you do not want to wait until they go bad. I have a no-uniseal policy now after having a unit a long time ago with them.
If you are going to control with Apex, then a second chamber is probably a good idea. With your high demand, you might soon switch to not use a pH controller anymore, but the second chamber will not hurt anything if you do.
My AquaMaxx leaked air in through the pump tubing. Easy to fix, but it took me a while to figure it out. If you get one, then just seal all of the connectors going to the pump, and away, when you get it.
