Bubbling earth juice?!

So I have heard that earth juice is more eeffective when bubbling/aerating for 24-48
hours but I have noticed about 24 hours in it starts to form a brown foam? Is this normal and also how long can I have the nutrients bubbling for before throwing away aand making a new mix?

The brown foam is expected and normal. That means its working. I've never just left I EJ tea laying around for days either, so I don't know how long it's good for. Just use it a day after you make it.