How much growstone can be used without raising the PH too much?

[Plantcrazed101]

Hi y'all,

So I want to create a version of Ray's semi-hydro set up for environments that tend to have lower humidity specifically for plants that I never seem to be able to water enough...

I would ultimately like to use seramis and clay pellets (NOT because orchidgirl is doing it! lol) but can't get Seramis here in the states. I have Growstone, but from what I understand, it raises the PH. So, my question is: how much Growstone would you guess I could use without interfering with the PH too much? Maybe have 50% Growstone (since it wicks better and holds more water than LECA...*I think*) 50% LECA?


I know there is Turface available here which is similar to Seramis, but the Turface has particles that are too small to use along with clay pellets without running into gas exchange problems.