Tclloyd0812
Crowing
Could be a possibility, but no signs of sickness were mentioned besides the dirtiness, and why would they all die simultaneously?...It sounds to me as if the issue was brought home with the chicks.
They could have had health health problems before you bought them. Especially because you said they were dirty and you never had issues with the brooder set up before.
I would give the brooder and everything in it a pedantic clean with bleach, dry it in the sun and try again.
Sorry that happened!!!
This is so confusing!