Food grade would be nice, but for now I just want to get a prototype up and running. I'd like to produce food, like fish, not necessarily algae as food. I expect the fish manure to feed the algae, so it won't really be a by-product. Removal of fish from the system, will require replacement of chemicals which are in the fishes. I think I can use land plants to solve that problem. Run some of the fish water through the land plants, with extra, so the extra water drains through and goes into the algae water. The plants then provide a living habitat for fungus chemically erode the sand part of the dirt to extract minerals and stuff, which then flows through the system to eventually be turned into fish. Using the plants would then simplify the process, so less thinking is required.

I figured the fish would make CO2, and some would come from the air of course. When I was younger, I did some research with Methane, and I found out that... I needed to do more experiments *sigh*. I never took any classes in biology, which is both detrimental and helpful. Detrimental in that I don't know what I need to know to solve problems, and helpful in that I don't know what not to try. Now I'm thinking that Methane production might also provide a CO2 source, and other things we need. I believe it'd be mutually beneficial.

My last experiment with one gallon of water, ran for 2 or 3 days doing nothing, then produced a cup of methane in about 2 hours, and then died. I think my methane got sucked up by all the plastic in my system (several pounds).

Both Methane and Algae are areas where almost nobody has done any research on. They are not economically practical for the soul reason that no one has done the research needed to make them practical. I think a little bit of research, and we can make massive amounts of energy very cheap with both of those. The research on Methane might not pay off yet, but algae I think is close enough to make it a better investment dollar wise than making some new invention or product idea. Algae has a guaranteed market, while an invention or product idea does not. Also, algae needs less initial investment.

Tony