It really isn't difficult, you just have to understand it.
Water enters the tank from the sump at a known gph, it needs to be drained, if you select the correct size return pump and the correct size drain the will never be any noise and never be a flood, you will not need a Durso nor will you need siphon holes if the return pipes go just under the surface.
If you decide to use a smaller drain hole than is required then you will get noise, caused by the drain turning into a siphon then losing siphon due to the flow increase, and repeating it's elf, then you read about Dursos and spend money buying something to fix the problem that you created in the first place by not using a bulkhead big enough to handle the flow.
Feeds from the sump need to go just slightly under the water, the depth they penetrate is a simple math formulea to tell you how much reserve space you need in the sump.
Fill the tank add water to the sump, turn on the pump once the tank and oveflow box are full then turn off all the power, the tank will drain to the sump as will excess in the overflow box and any back siphon from the return lines from the sump.
Now fill the sump to a level that you feel comfortable having it at, ie 2" below the surface, turn on the return pump and wait until the water is now moving through the system , you will see the sump level fall to its operating level, draw a line at that point and never add water to any more than that level when the system is running.
I will put money on it that almost any tank if installed with a 2" drain with a 1" return from the sump with almost any pump up to 1800gph will be silent, safe and have a zero chance of flooding.
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