I am a big fan of Aqua Soil, but the nutrients must wear out eventually. Even if it didn't have any nutrients it would still be a great substrate. You can break it down into powder if you squeeze it in between your fingers, so it's not as solid as say... EC, but I think that that is a good thing. That's why it won't scratch glass and is easy to plant in.
I chose to go without Powersand, I dose via the EI.
__________________
-Craig
|