Pro-Mix 3.8cuft Pro BX Compressed BalePro Mix BX is a solution for growers seeking to benefit from both the nutrient retention ability of vermiculite and a per lite content providing limited but proper drainage capacities. Combined with high quality fibrous peat moss, this formulation is ideal for growers looking for a general purpose medium which creates a well balanced growing environment. General purpose, professional grade peat based growing medium High water holding capacity Contains