Mr. Baird said I should check with you regarding moss & something called alguariti (sp??) on a pond. My friend has about 25 acres with a pond on it, and he was wondering how to organically get rid of moss & this other stuff in his pond. Mr. Baird answered my other question, but he recommended I ask you about the pond problem. What would you recommend? Would cornmeal in something (sock or pantyhose with a rock for weight) do or is that just for algae? Thank you.

Cornmeal works great on free floating algae that is not connected to the bottom. Use 150 lbs/surface acre, spread into the water, not on top of the moss, or sink the bags to the bottom with rocks.
We don't have an organic product for lilly pads, grasses, catails, pond weed, etc. Physical removal is the only tool.
Tony M

Thank you very much for your solution. I appreciate it.

Be sure you know what you are dealing with, as Tony states--cornmeal does not help with duckweed and such plants. "I" thought we were dealing with "scum" or "algae", but it turned out to be very tiny little plants with three or four tiny leaves and long roots (duckweed). We eventually lost several thousand dollars of fish from lack of oxygen. The corn meal just increased the organic matter in the ponds. On other things, cornmeal can be great.