DIRTY is formulated for soil and peat based growing mediums. Built-in alkalinity and Cation exchange enhancers make it easy to use with premixed media products like Promix, Sunshine and Light Warrior. USE WITH +LIFE and SHINE for optimum results. NOTE: This product contains natural ingredients, therefore may result in undissolved sediment and biofilm. For a completely soluble formula, see RO/SOFT and TAP/HARD.