What’s the NPK of this crust? The common reddish color makes my brain think amino acids are present but science doesn’t support that theory.
How much money am I wasting washing this stuff down the car wash drain pipe?
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Lol, toss it in some water and see what happens. Give it a good shake too, for good luck.
Just poor nutrient management, imho.
Wash that stuff off on your outdoor trees/garden/shrubs. They’d probably love it.
Are you using liquid organics or dry amendments? Some more grow details would be cool. You don’t really want runoff in an organic setup either way.
Welcome to OG @Steambug 
Nobody is going to be able to tell you that lol. You’d have to get it analyzed by a lab, but if you don’t see mold growth and it doesn’t smell of rot it should be no big deal to throw in your garden. If it smells foul chuck it, that indicates formation of anaerobic bacteria and is then just a vector for pathogens.