The by-product of inefficient ASV generation, and often an inevitable part of Syrup operations. Bilge is corrupted magic in “physical” form. It is difficult to store, and almost impossible to dispose of. It is an incredibly dangerous and volatile contaminant with no real practical use. Attempts made to weaponize it usually backfire with deadly consequences.
Most operations producing Bilge simply take it to the brink and toss it into the abyss. I’m sure that doesn’t have any horrendous repercussions looming on the horizon.