I'm not sure what you are asking with manifold vs. supply tank.
The return pump can be controlled via my apex so I can always turn it down if the siphons can't keep up. I'd prefer to use the 3/4" as siphons because I want to be absolutely sure that 1 emergency drain could handle the load of both siphons breaking (very unlikely, but this is a lot of water haha)
The return pump can be controlled via my apex so I can always turn it down if the siphons can't keep up. I'd prefer to use the 3/4" as siphons because I want to be absolutely sure that 1 emergency drain could handle the load of both siphons breaking (very unlikely, but this is a lot of water haha)