Thanks that’s helpful. I’ve been debating on whether or not to leave it in there bad have had equal mixed responseI realize you weren't asking myself, but I don't have the bubble trap installed anymore (the sponge filter before the return chamber). Someone else on this forum once said "Let it flow!" and I tend to agree. From my understanding the sponge filter helps to eliminate micro bubbles and also filters out some particulate. Using filter floss in my cups so particulate doesn't seem to be an issue in my setup. Likewise with the microbubbles. I don't really notice any in the display, or at least none that bother me.