I always use 6 with normal EC values and 6.5 using high EC values. That's because when you use a EC of say 2.4 the soil uses it's chalk asa EC buffer aswell so it doesn't have much room left (chemicaly speaking) for selfregulation of the soil's acidity.

When I'm growing hydro I'm using a ph of 5.6 in veg and 5.8 whiles blossoming.
britewire Reviewed by britewire on . PH Sorry to ask here, but I have tried searching for 'ph' and get no hits. Don't know what I'm doing wrong... Just a quick question. What PH should your water be prior to using it? I've heard anything from 6 to 7, so I'm confused. I am using soil, not hydro. Thanks, Rating: 5