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Mushroom Farmer. The first stop in this episode is actually not Scotland (though there is a lovely bagpipe dirge playing, and some fog hovering over the moors, which is actually a pile of soon-to-be-compost). To start things off, the thoroughbred-pee-covered hay needs to be covered with Urea, a nitrogen-rich compost enhancement, made up of mostly poo. This in turn makes the hay compost faster, which is needed to raise the temperature to 180 degrees.

Once the heat gets high enough, the compost is packed into shelves in a dark warehouse, and then the spores can be seeded and covered with dirt. Just 20 days later the mushrooms sprout and can be picked by hand and shipped everywhere. The remaining mushrooms, compost and water is recycled to be used the next time around. Nothing is wasted here.

Storm Drain Cleaner. While in the LA area, there are thousands of storm drains that need cleaning. These storm drains are used in an attempt to help keep the oceans clear of debris. It doesn't work all that well, as tons of trash still drains to the oceans. But nonetheless, the storm drains catch all sorts of debris, including steak knives, body parts, weapons and even funny money. Similar to the septic tank truck on Worm Dung Farmer, this giant truck acts like a huge vacuum to suck up everything it can.

Copper Brass Foundry Worker. The final stop on this episode was the Lincoln Foundry in Erie, Pennsylvania. Incidentally the foundry was the backdrop for the Dirtiest Water Jobs special, but that's neither here nor there.

The first step is to mix up a batch of sand to form a mold. Then, using a steel mold you press the sand into shape and then melt the metal in a vat, and using the rails running all along the top of the foundry floor, you move the vat into position wherever it is need and fill your mold, trying not to spill any of the two-thousand degree molten metal.

Once the metal cools a bit, you can break the sand on the shaker table and you've got (hopefully) solid drains in two pieces. Then they can be cut, buffed, drilled and they are ready to fit any shower where needed. So long as you're not the last one out, you're done. If you happen to be the last one out, you've got to clean out the pit, where all the broken molds go to die. That's a huge hold that is full of all the scattered sand molds, and it is indeed a pit.