Parameters Appearance beige color Size 1mm~20mm Magnesium Percentage 40% ORP Max -50mv PH Max 10 Density g/cm3 1.35~1.4 Hardness High Specification g/cm3 1.3~1.55 Bulk Density g/m3 0.74~0.78 Packing 20kgs per woven bag,1000kgs per pallet Function: Restore PH value between 8 and 10, make alkaline water. Durable, could use at least 1 year. Provides more than 20 kinds of nutrient. Mineralize your water. Anti-bacterial. Absorb micro particles and microorganism. Remove foul taste and smell from water.