The sump plug is usually magnetic so any ferrous metal particles should be attracted to the plug. So you could assume that the other particles and sludge are nonmagnetic.
Fossils and sediment
It is found in faeces
The material is most likely a nonmetal. Nonmetals are typically nonmagnetic, can be found in gaseous form, and do not conduct heat or electricity well. They often react with other elements to form compounds.
small and large sediment
Amorphous sediment in urine are things like crystal phosphates, uric acid stones or calcium stones that are found in the urine. Certain amorphous sediment found in urine is normal. The cause of amorphous sediment depends on the type of sediment. For instance, uric acid stones can be caused from not drinking enough liquids.
An amurca is a sediment found in olive oil.
United
sediment rocks
Smaller sediment, such as silt and clay. It is smaller, so it can be carried higher into stronger winds, which blow the small sediment far from its source.
A centrifuge separates a solution based on density. An electromagnet, like those found in junk yards, separates magnetic materials from nonmagnetic materials.
Dragonfable Rocks
Found in most lakes and ponds rivers