If you are looking at the Epsoma Garden Lime it is dolomite lime, which includes calcium and magnesium. You can crush some up into finer particles if you need it to act faster. Add it to your peat mix and let it sit damp for a week or two and your PH should be stable. 1 tbsp lime/gallon of your mix.

Pre mixed peat based potting soils already have dolomite lime added but if the soil will be used for a very long stretch or reused you may need to add more down the road.
SupraSPL Reviewed by SupraSPL on . Difference between dolomite and garden lime? What is the difference between fine dolomite lime and garden lime / pulverized limestone? I use garden lime outside in my garden. I want to mix my own indoor potting soil that calls for one cup of fine dolomite lime. What's the difference? I've also heard of hydrated lime. Is that garden lime, either? Rating: 5