Still waiting for the Pond Shield. Its delayed due to black Friday and Christmas.
In the mean time i have tested the surge tank design. And filled the sumps with water to check for leaks. So far so good.
The surge tank is a 100L tank that i drilled in the bottom to fit a 50mm (2") bulkhead. This is connected to a 50mm motorized ball valve. It drains the 100l in about 15 seconds. I think this will give alot of flow in the tank! I still have some testing to do, but this i need to do when the main display is connected. This is to check for air and sound in the design. I have some issues with the motor for the valve. This is a 220v motor wich opens when you apply power and closes when you remove it. But the return is operated by a battery inside the unit. This means the the valve have to be powered for some time to charge this battery. The time needed to charge is more than the time it takes to empty the tank. This again means that it will suck air from the bulkhead. I could change the actuator to be fail open. This means that it will be powered when closed. But if my system loses power this valve will open and all the water will go in my sump. Which i think will overflow with this and the water from the tank! I have a few ideas that i need to test, so i will have to come back to this at a later stage!
Below a few pictures and a video of the surge tank in action.
Sumps with water:
And the video:
Nice work!