What the heck is this? It's on the bottom of my Loc-Line return plumbing. No direct light hits it.
I noticed some little white coiled "feather duster" look alikes, but those are real small, like 1/8th of an inch. They appeared rather suddenly a few days ago, but I just noticed this today. As you can see this thing is much longer. I looked but can't find a beginning or end to it.
