Thanks for the reply!
Let me explain my process more...
I'm aware of the requirements of these creatures, and as I stated, water here is clean and cheap... so water quality issues are not likely to be a problem. I can change it out as needed. And when I say clean, I mean I used it right out of the tap and straight into aquariums INCLUDING salt water tanks. Jealous anyone? lol Ideal location for a site would include a well like I had there.
Now imagine a big tank full of snails, food and poop. I would be vacuuming the mulm (poop) into another tank where it would settle for an as yet undetermined amount of time ( would guess a day). Then the water is run off the top and remaining solids would then go for processing. I have ideas for this which mostly involve retrofitting equipment from other industries. A centrifugal separator would spin the water out leaving the brown/yellow/green gold! lol Again, lots of r&d needed, but I know from in the gravel of my previous snail tanks that there is plenty of solids if I can find an efficient way of collecting it.
What species do you think would eat everything? We have a lot of commercial green houses around and their waste would make great food.
And for everyone, if is good to remember that an "Aquarium" is not the same as a "tank". We can have many tanks in an aquarium, like sumps and such, so I can have huge volumes of water circulating through a system but have a densely populated feeding/composting tank. It occurs to me now that if I have a slow moving part of the system with baffles then a lot of poop will be settled out away from the snails too. Good... I'm glad I thought of that. Thanks! lol
My real secret is the name of the manure product, but that is copyrighted yet, but I assure you, it is the best name you've heard in a long time. I just need a way of getting the poop in bags!