Any excess in the sump...2" give or take goes down the drain before it hits my floors... I used to run a constant drip with the freshwater like an auto water changer so now its a fail safe.... but maybe at the cost of a return pump in an outage...

Any well built sump can handle all the back flow. Why so complicated?

it wasnt designed for a 100 gallon refuge lol... that changed everything....
Instead of dealing with a total square footage im now dealing with the bubble trap at the end....and thats like 20 gallons a foot give or take x2 lol