It is at least in part bio-solids and yes human waste which comes from drainage from waste water treatment tanks. I used to work in waste water as a laboratory technician and in the same area as where this product is produced (I have however never been to the actual facility where this is from). What happens is basically the solids are separated from the liquids in the tanks (like one million gallon tanks or more) and the sludge that accumulates at the bottom is siphoned off and sent to a belt-press where it is combined with a polymer to produce the product. While it is in the tank it is at least sometimes given enzymes to grow helpful bacteria to clean the liquid and solids pre-separation so that when the liquids go to the final phases of treatment where chlorine and CO2 gasses are introduced, it will be clean and released back into the environment as long as it meets the local, state and national standard of safety and sanitation. Sometimes the sludge is sent to a drying bed where it sets in the sun and dries and I have seen a tomato plants grow as well as melons of various types along the sides of the beds and they looked extremely healthy. They came through the system as seed from various sources in the influent and settled there and grew - I never ate any of it though but the animals around the plant such as birds and raccoons would. So I assume there is likely some other additives in there but I have no idea how they make it from that point. At the plant I worked at the sludge was haled off from the plant about every two days. So even though it has people poop in it , it is completely safe and sanitary. Anything you place in your garden or lawn will have the exact same biological makeup as long as it's not synthetic. Personally I would much rather use this than go with a synthetic chemical feed.
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