[Vogata]

Testing BH is for us a past stage and we just refer to JR in this tread and concur. The void space media is for an end station.
I really don’t know what’s going on from day to day in the US, but have notices that the “Cactus” is talked about as something new. Here Sieves have been with us since we started in 1992. We mostly like the Germans are prone to the fully stainless steel type, but the Sieve function is the same. This is the one were running http://www.ia-products.nl/index_UK.htm not sure if you even got them in the US.

We have mechanical filtration with Vortex fall – Sieve for outdoor heavy system and just Sieve in smaller and indoors systems.
Biological have a indefinite multitude of solutions and we are at the moment on a European type of BubbleBead that is simpler in mechanical design in the typical US model, find it easier to both automate and use manually in the long run. Since they don’t fully “make our day in outdoor systems we are feeding them directly into the trickle tower contraption with marvellous and incomprehensible side effects.
Its in this last section we at the moment are modifying and trying to optimise performance and make it easier to maintain, adjust and scale.