I disassembled one of my Ecotech MP-10 powerheads to clean it and found these white things. They were in a thin space between a rotating part and a stationary part. Interestingly, they were attached to the rotating part. They are kidney shaped, about 1/8 inch long. I scraped them off with a toothpick and found them to be stuck pretty well to the plastic. I deformed them somewhat scraping them off. Anyone know what they are?


