i always add 1tbsp dolimite lime per gal to my promix and have never ever had any ph issues since i started doing it almost 2 years ago! i also always ph all nutes /water to 5.8-6.2 before give it to the plants. make sure you use dolimite lime and not hydrated lime(way too strong)
justaseed Reviewed by justaseed on . Do YOu Add extra Lime to Your ProMix? I have used promix and perlite so far for my grows because Its so easy to get. I don't have a car. So I don't have many options. I constantly have low RunnOff Ph problems. 5.7 to 6.2 Even when I Ph Up my water to say 7.5 or even 8 if it falls extreamly low. Should I assume that my ProMix from Crappy tire (Canadian Tire) doesn't have a sufficent amount of dolomite lime added to it. TIt says Netural Ph 7 on the bag but im starting to wonder. I feed with Botanicare Nutes Pro grow pro Rating: 5