I have modified the system to make it cheaper and easier to build. I now connect an external stand pipe to the center drain and purge the solids out around the drain twice a day by pulling up a gate valve. I still use an upflow filter with a u tube siphon but no connection to the tank other than the siphon. I also now use a moving bed bioreactor filter vs. the RBC. Just built my third RBC for a conference demo and they are getting expensive to build. Close to $500.00 in materials. The moving bed filter is much cheaper to build and works pretty good.

I hope to get the pics of the news system put together for a newsletter article tomorrow and can post them here if anyone is interested.

Last edited by Cecil Baird1; 04/20/13 11:05 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.