I used powersand on 3 tanks origianlly, never could find any differences between those and aqua soil alone.
So I suggested that it is a non significant/unimportant part of the ADA sediment system, along with Peanc (good god), tourmaline (crazy Bio electric gibberish) and most bacterial starters.
To further corroborate this claim, I tested PS and ADA AS, ADA As is where all the nutrients are.
PS has a little NO3..........but this quickly leaches out of any sediment, unlike the NH4 in ADA AS.
Pumic is just something that Amano used before the days of aqua soil.
It was popular as the heating cable myth and for the same reasons.
But well growing plants rapidly form huge root systems in soil, so they add O2 to the soil.
So there is no need to add flow etc to soil, in fact, Tropica show that simple diffusion in plain sand was actually optimal.
So there's 4 pieces of evidence that strongly suggest otherwise and virtually no support for the claims made by ADA.
Semantic arguments will never win this one. Plants do grow due to magic or some weird Western perception of Asian mysticism.
Horticulture is well understood.
My 120 Gallon tank used only ADA AS, all my 3 planted tanks do with rooted plants.
I have many of the so called hardest submersed plant species, growing and thriving in that tank.
They grow much faster than ADA tanks.
Maybe it is the lack of power sand eh?
Who knows, could be....just saying....... and using the same logic folks use to support it's use
Same stuff was pulled supporting heat cables too 25 years ago with Dupla FYI..........
No support for it.