A house I'm trying to sell has a dirt basement with a stone wall
foundation (an old farmhouse). In wet weather water comes in and yes
I've done everything I canoutside to keep that from happening. My only
option is a sump pump I think. But the water that gets in is either
already muddy or gets dirty from the floor. Will sump pumps handle
muddy water or are they made only for clean water pumping?

Recommendation? I'm willing to pay megabucks for the right piece of
equipment.

My next option is dig a hole about 20 feet deep and cover it with a
grate ;-)