I have made a couple huge bio ball towers and could never over come the nitrate. I would like to know this guys theory on "vaporizing" LOL, I need to learn this. I do not understand how he is exporting nitrate in an oxygen rich environment. Even with my 6 foot tall tower at a very slow trickle I could not export the nitrate.
Most ponds will take care of nitrate as they age and become like an ecosystem. I would bet this is likely what has happened and it was not his tower deal IMO.
The enclosed and open towers I experimented with where failures for exporting nitrate. Maybe someone else with some more brain power can explain why his exports nitrate. I dont get it at all. Very interesting build he has for sure. Thanks for the info Sir.