C02 System 10Kg presurised co2 gas tank.
But it used to be low tech, the pic was taken when is wa still low, well low as in no co2 and very very bad ferts(ferropol).
Now it is as high tech as i can get it.
From redchigh on 12/11/10
wow, gorgeous. Is it low tech? (You don't mention CO2.)
Tattedtanker's 40 gallon freshwater fish tank, Menagerie