Questions for those who have a HOB U-tube type overflow.

[trilinearmipmap]

1. How do you prime these overflows?

2. Does the siphon ever fail?

3. Do you need a minimum amount of flow rate to keep the siphon from failing?

4. How is their noise level?

5. Is there any problems with siphon resuming after a power outage? I am thinking of running mine only at night to a refugium if the noise is too much.