Adult Brine Shrimp are Dirty?

[Harris Tiu]

Hi Folks,

Anyone here with experience using Adult Brine Shrimp as Feeders or Treats?

I ask because I want to culture them myself for this purpose.
Although what bothers be is that they are filter-feeders and they might be ingesting their own poo suspended in the water column.
Do you think they are dirty or are they okay?

Thanks!