QUOTE
i think ya need to have a good read of the hydro problem solver and faq pages plus do a heavy bit of searching aroudn the forum
Second that
EC (electoical conductivity) is related to PH. Optimal EC = 2.0 (Using a truncheion), and optimal PH range is 5.8 - 6.2 (Using a PH meter)
These 2 impliments, or instruments (toos of the trade) are indespensible to growing hydro style
NK..