What is this stuff?


Well-known member
Jul 17, 2012
Forest, VA
This year i have noticed these black brittle flakes on the bottom of my pool. I am fairly certain that it is from my equipment. Has anyone ever seen this? My pump is working and been running non-stop but sounds different. Could it be that the plastic impeller is coming apart? Not sure what to make of it. Any replies are always appreciated



Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Pieces that big would not be able to get from the pump impeller through your filter into your pool.

Confirm that is plastic.

You have black Jandy valves in your plumbing? Your heater is after the filter and could be shedding parts.

Anyone in your neighborhood doing exterior or roof work?