Yup I watched the videos.
Bio Scrubber is just something I pulled out of my head that sounded good. :stoned:

I was also wondering how much nutrients you might lose with the venturi method. One thing I can say though, is my ec stays pretty constant in accordance with water usage.

I think I may build an external venturi filter for my next grow and see what happens. :detective1:

I may even pick up on of those aquarium filters to try out this grow.