Dolomite lime buffers your ph so it stays around 6.5 which IMO is perfect for soil, if your using a peat based medium then after time the peat starts to break down and make the soil acidic thus locking out certain nutrients. It also adds a bit of calmag to give them a little extra boost. I would recommend the pellets because by time you REALLY need the lime is when it starts to kick in and keep your soil at a perfect level. I used to worry about ph when I switch to using promix but after seeing the results of adding it, I haven't even had a thought about my ph. Thank god or mother nature for Lime.. 1 cup DL per 1 cubic foot of soil. And its cheap as hell too