So i work in a pool store and a customer came in with this he showed me a video of the pool and this brown stuff was floating on the top and when this is undisturbed in a bottle or container it sinks but in his video it was just floating in giant clumps all across the pool so i was wondering if anyone knows what this might be i felt and and some particles do feel hard but majority of them dont i cant feel them i was thinking it might be dead algae or pollen but i dont think its pollen season right now... any ideas?