I was adding the lime since this is a mix for next years outdoor..The promix HP has lime already. With the volume that your talking about you’ll probably want a good quality soil pH probe. Promix like any other product can vary from bag to bag.
Ill explain better.. I veg indoors from oct til may in 7 gal pots, once the end of may comes along I then transplant outdoor into pre dug holes ive already made, so outside in these holes that are dug already has about 45 gal of used soil, a bit less after cleaning them out.. So I was looking to mix the lime in it to refresh the older soil..
Usually I just replace all the soil and start fresh with liquid nutrients but this year I am trying to make it easier and more cost efficient for myself.
But this is why I am posting here so I make sure I do it right from the start since I only get 1 harvest a year.. Im fully open to everyones advice and more than appreciate.the help