PRO MIX Fertilizer BK25 2.8 cf New improved formula Containers Environmental Profile Renewable Resource Based Containers Environmental Profile Renewable Resource Based Ingredients Water Conservation Benefit Helps reduce irrigation frequency and volume Soil Penetration Enhanced through non ionic surfactant technology How Hydretain Works apply prior to initiation of weed growth or when weeds begin active growth PRO MIX BK25 is a medium weight growing medium designed for the cultivation of greenhouse horticultural crops in 4" pots or larger sphagnum peat moss and perlite makes for a general purpose product that provides good drainage and low water retention capacity