Kind of off topic. For what it's worth, you CAN get aphids/fungus gnats from EWC, and Composts used in teas.
I always brew my bennies, but stopped with the EWC after getting gnats. Thought it was a fluke, tried again and more gnats.
No more EWC, no more gnats.
I add a 5 gallon bucket to 55 gallons every 3 days and I never have any root problems. It'll definitely make your roots grow better, bigger, and stronger.
Doubling yield? Naw. Healthier roots, and plants with less chances of disease? Yes.
Not saying this is typical, but something to be aware of.