It won't clog.. probably ever.. My syphon has that stuff in it too and I had a xp3 with it in it.. completely normal. I tried to clean my xp3, and really wasn't worth it/didn't really work. IMO I think it's just bacteria.
12 Volt Man;1256903; said:if its chocolate brown and sort of jelly like inside, which is common, they are bacterial colonies. leave them. they are good!